Photograph of Lyndon Johnson shaking the hand of a woman in a checked dress. Lady Bird Johnson stands behind and between the two, holding a paper cup and wearing a collared dress. People are walking behind the trio near a small building and trees.

Photograph of Lyndon Johnson shaking a woman's hand amid a group of people near a parked car.

Photograph of men and women chatting in the foreground as people walk by a building in the background.

Photograph of a woman dressed in a prairie dress costume and a man holding a cup standing to the left of Lady Bird Johnson. A crowd of people stands near a picnic table and a building.

Photograph of Otto Lindig (lower right) having a beer in a bar with other people. He is sitting at a table with two other men with beers. The man in the middle isn't wearing a shirt. Behind them, a boy sits at the bar and two men stand.

Photograph of Otto Lindig (lower right) having a beer in a bar with other people. He is sitting at a table with two other men with beers. The man in the middle isn't wearing a shirt. Behind them, a boy sits at the bar and two men stand.

Photograph of Texas Governor John Connally addressing a crowd at Randolph AFB during the arrival of President Lyndon B. Johnson. Seated behind Governor Connally are President Johnson and Lady Bird Johnson, Walter W. McAllister (Mayor of San Antonio), and several other unidentified people. President Johnson visited San Antonio, Texas, on this day to take part in HemisFair '68 celebrations and festivities.

Photograph of President Lyndon B. Johnson, Lady Bird Johnson, Governor John Connally of Texas, and other people standing in a podium booth in front of a crowd at Randolph Air Force Base, on July 4, 1968. Walter W. McAllister (Mayor of San Antonio) and William Sinkin are visible standing in the background. President Johnson visited San Antonio, Texas, on this day to take part in HemisFair '68 celebrations and festivities. Several ladies, wearing colorful festive type dresses and hats, are standing in line in the background. A portion of the Presidential aircraft, Air Force One, is also visible in the background.

Photograph of female actors in a play at HemisFair '68, including two adult actors standing to the left -- one wearing a tiger-like costume and the other dressed in an oriental-patterned robe. A small group of child actors are kneeling in the background to the right, and some are wearing Oriental-type dresses.

Image of Boat rides near the Texas Pavilion at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio.

A close-up profile view of Bob Hope speaking to or entertaining a group of people. Bob Hope was one of the entertainers who performed in the convention center theater at HemisFair '68.

Image of Bolivia Pavilion at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio, Texas.

Image of the Bolivia Pavilion at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio, Texas.

Image of the Canada Pavilion at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio, Texas.

Image of the Colombia Pavilion at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio, Texas.

Image of the Conference at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio, Texas.

Aerial view of downtown San Antonio at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio, Texas.

Image of the Dress exhibit at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio, Texas.

Photograph of a hostess (center of image) wearing a striped sleeveless shirt, mini-skirt, and boots, and two men dressed in cowboy outfits standing and conversing in the middle of a plaza at HemisFair '68. There are several onlookers standing in the foreground and background and the Tower of the Americas is visible in the background.

Photograph of a family standing on a curved staircase outside the San Antonio Convention Center. The focus of the top half of the picture is of the mural “Confluence of Civilization in the Americas” by Juan O’Gorman

Photograph from the ground floor of the San Antonio Convention Center, looking up toward the decorative domed ceiling. In the center of the image, a family is standing along the railing of a spiral staircase in front of the Carlos Merida mosaic mural and the father is holding up a camera pointed toward the ground floor.

Photograph of people inside the San Antonio Convention Center, including a family of four at the top of the staircase in front of the Carlos Merida mosaic mural, facing out toward the interior. The man is looking down toward the floor and taking a photo. Curved staircases are visible at right and other people are standing in front of another portion of the mural on the ground level.

Image of Fiesta Island rides at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio, Texas.

George H.W. Bush (Texas House of Representatives) and Gov. Nelson Rockefeller of New York in front of the monorail at the 1968 World’s Fair known as HemisFair ’68, held from April to October 1968 in San Antonio. The Swiss-Sky ride gondolas, and the Tower of the Americas can be seen in the background.