Di-tertiarybutylnitroxide (DTBN), which they have tried to use as a trapping agent to identify the species giving rise to the photo-induced EPR signals in photosynthetic materials, functions as a Hill reagent with spinach chloroplasts. Evidence is presented which indicates that the reduction of DTBN is affected by photosystem II of the electron transport system of spinach chloroplasts. The reduced form of DTBN, the hydroxylamine, undergoes a photo-oxidation with spinach chloroplasts. Possible explanations of this apparent inconsistency are presented. A product which could be ascribed to a chemical coupling reaction between the nitroxide and the radical species giving rise to the photo-induced EPR signals in spinach chloroplasts was not detected, even using radioactive tracer methods.

Article documents the history of printing in Oklahoma in celebration of the centennial anniversary of the first printing press being placed within the territory.

Article narrates how an emissary of the Mexican government, Santos Flores, was mistaken for Manuel Flores, a man trying to turn the American Indians of Oklahoma against the young Republic of Texas, within the newspapers. Manuel was believed to be dead due an altercation with Texas Rangers at the time of Santos' arrest and escape.

Article narrates the history and construction surrounding Hildebrand's Mill which was operational during the 19th century as a lumber mill.

Article narrates the events surrounding the "Tragedy of Goingsnake," a shootout that resulted in nine deaths and numerous wounded. The shootout resulted from a judicial jurisdiction dispute regarding the trial of Ezekiel Proctor, a Cherokee man charged with the murder of Polly Kesterson.

Article narrates the history of how two men, Carl C. Magee and Gerald A. Hale, created the parking meter to help Oklahoma City solve the problem with overcrowded parking lots. The article also details the impact their creation had on the world.

Article illustrates how the Choctaw people combined traditional medical practices with those created by Europeans during a time where diseases spread rapidly and killed indiscriminately.

Article illustrates the significance of Indian agents at the Neosho Agency who were charged with maintaining control over the Indigenous people on their reservations. The article focuses on the life of one agent: Major Andrew J. Dorn.

This section includes the minutes for the meeting of the Board of Director's of the Oklahoma Historical Society. Included within the minutes is a resolution honoring William J. Holloway, a list of gifts received by the organization and a list of new annual members.

Article chronicles the history of successes of fur merchants Auguste and Pierre Chouteau who operated along the Arkansas River following the Louisiana Purchase.

Article chronicles the history of St. Agnes Academy for the Choctaws, a mission school located in Choctaw Nation. The school was destroyed by a tornado in 1945.

Article chronicles the creation and history of the Civilian Conservation Corps in Oklahoma. The program was created during the first hundred days of President Franklin D. Roosevelt's New Deal as a means to protect the conservation of parks and camps.

This section includes the minutes of the annual meeting of the Oklahoma Historical Society held on April 23, 1970. Included within the minutes is a letter from William J. Holloway Jr. thanking George Shirk for honoring his father and a list of gifts received by the organization.

Notes and Documents column including a report from Oklahoma State University announcing staff changes and activities and notes on the Heavener Runestone.

Article narrates the many court cases tried inside of the Tobucksy County Courthouse, a building that was once the home to pioneer physician Dr. Daniel Morris Hailey. The building is now called the old Choctaw Indian Courthouse.

This section includes the minutes of the quarterly meeting of the Board of Directors of the Oklahoma Historical Society held on October 29, 1970. Included within the minutes is a list of gifts received by the organization and a list of new annual members.

Article chronicles how four men and their families traded with the Cherokees shortly after the Civil War, at a time where most Cherokees in the Indian Territories were still rebuilding their homes and livelihood. The article shows the hardships faced by both the Native Indians and the settlers.