Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination. This image shows a crowd gathered at the southeast corner of Elm and Houston streets at approximately 1 p.m. Police have used thick rope to keep the crowd on the sidewalk and out of the intersection. The front row of the crowd appears to consist mainly of school-age young people.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination - between 12:30 and 1 p.m. This image shows a crowd gathered in front of the Texas School Book Depository. Police officers and police motorcycles appear in the midst of bystanders around the southeast corner of the building; the crowd has spilled off the sidewalk into the intersection of Houston and Elm streets. Signs listing the publishers who leased space in the building can be seen on the south and east sides of the building's corner.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows an armed Dallas Police officer in the intersection of Elm and Houston streets following the assassination on November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination - between 12:30 and 1 p.m. This image shows a Dallas Police officer standing in the street at the intersection of Houston and Elm streets outside the Texas School Book Depository. The Dal-Tex building is visible behind him; the Book Depository building is not visible.

Original 35mm black and white negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination - between 12:30 and 1 p.m. This image shows a Dallas Police officer, holding a shotgun, standing in the street at the intersection of Houston and Elm streets outside the Texas School Book Depository. The Dal-Tex building and the County Records Building are visible behind him; the Book Depository building is not in the picture.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination. This image shows a Dallas Police officer holding a shotgun, standing amongst parked cars on the north side of the Texas School Book Depository.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Captain J.W. "Will" Fritz and Elmer Boyd, both of the Dallas Police Department, exiting the Texas School Book Depository on November 22, 1963. Elmer Boyd carries a rifle in his right hand.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination. This image shows Dallas Police officers in the intersection of Houston and Elm streets. The Dal-Tex Building at 501 Elm Street is in the background.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination. This image shows several Dallas Police officers holding shotguns, standing in the intersection of Houston and Elm streets near the Texas School Book Depository. The Dal-Tex Building at 501 Elm Street is visible in the background.

Original black and white photographic negative taken by Dallas Times Herald photographer William Allen. This image shows Dallas Police officers, investigators and reporters gathering outside the front entrance to the Texas School Book Depository shortly after the assassination as they waited to learn if any suspects were found inside the building.

Original black and white photographic negative taken by Dallas Times Herald photographer William Allen as police and detectives guard the front entrance to the Texas School Book Depository building within 50 minutes of the assassination. Shortly after this picture was taken, Dallas Police officer M. N. McDonald, right, raced to Oak Cliff to investigate when he heard on the police radio that an officer had been shot there.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination - between 12:30 and 1 p.m. This image shows the south-facing exterior of the Texas School Book Depository as viewed from Elm Street. The southeast corner entrance to the building is visible, along with the first six floors of the building. The building's seventh and top-most floor does not appear in this picture. Open windows are visible on the fourth, fifth and sixth floors of the building.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows the exterior of the Texas School Book Depository the afternoon of November 22, 1963, after the assassination. A police officer and several police motorcycles are visible near the southeast corner of the building. A corner of the Hertz sign can be seen on the roof of the building. Several windows are open on the fifth and sixth floors of the building. An unidentified man in a shirt with rolled sleeves and a tie can be seen moving boxes in the southeast corner window on the sixth floor.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows the exterior of the Texas School Book Depository the afternoon of November 22, 1963, after the assassination. Many police officers stand around the entrance and southeast corner of the building. An unidentified man in a white shirt bends over a box visible in the open southeast corner window on the sixth floor.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination - between 12:30 and 1 p.m. This image shows the exterior of the Texas School Book Depository. Dallas Morning News reporter Jim Ewell can be seen in the foreground of the image. Cars, people and police officers crowd around the base of the building. Windows are open on the building's upper floors, including the southeast corner window on the sixth floor. Piles of boxes can be seen through that window in an area that was later identified as the sniper's perch. The Hertz sign on the roof is partially visible.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination - between 12:30 and 1 p.m. This image shows the exterior of the Texas School Book Depository. Cars, people and police officers crowd around the base of the building. Windows are open on the building's upper floors, including the southeast corner window on the sixth floor. Piles of boxes can be seen through that window in an area that was later identified as the sniper's perch.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination - between 12:30 and 1 p.m. This image shows a Dallas Fire Department fire engine in the intersection of Elm and Houston streets. Police officers and cars and men wearing fire department coats and hats fill the intersection. Crowds can be seen on the sidewalks and people also lean out of office windows in the Dal-Tex Building.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows two Dallas Police officers (Left: Inspector J. Herbert Sawyer. Right: Marvin Wise.) guarding the entrance to the Texas School Book Depository on November 22, 1963 after the assassination. The officer on the right holds a shotgun in his left hand.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen Friday afternoon after the assassination. This image shows Dallas Police officers outside the entrance to the Texas School Book Depository.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Dallas Police officers on the northeast corner of the Texas School Book Depository on November 22, 1963. Police officers have used rope and vehicles to separate the crowd from the building.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows Dallas Police officers on the northeast corner of the Texas School Book Depository on November 22, 1963.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows the recreation of the sniper's perch by the Dallas Police on the sixth floor of the Texas School Book Depository on November 22, 1963. Police moved the boxes during their search for evidence; this recreation shows the boxes after the police had put them back in what they thought were their original positions.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows the recreation of the sniper's perch by the Dallas Police on the sixth floor of the Texas School Book Depository on November 22, 1963. Police moved the boxes during their search for evidence; this recreation shows the boxes after the police had put them back in what they thought were their original positions.

Original black and white photographic negative taken by Dallas Times Herald staff photographer William Allen. This image shows three men (front to back, Harold Doyle, John Gedney, and Gus Abrams, who is hidden behind John Gedney) being escorted to the Sheriff's office by Dallas Police officers, Billy Bass in the front and Marvin Wise in the rear, on November 22, 1963, about 90 minutes after the assassination.