Photograph of Henry Kedding standing on an alkali spot after 2 tons of gypsum was applied to field in 1956. Directly behind Kedding, are several buildings and structures, which include houses, barns, and silos. The back of the photograph proclaims, “Alkali spot after 2 tons of Gypsum was applied in 1956. Before planting, area on left of drain untreated. Right of terrace treated in 1957 – 2 tons per acre. Henry Kedding in photo.“

Photograph of cuttings of a sanbar willow being set out in a trench prepared on bermuda grass (?). OK-4106-14.

Photograph of Bill Sharpe standing between two fields, which the right side received five tons per acre of applied gypsum, while the left side did not receive any gypsum. This field is near Will Rogers Air Port in Oklahoma City. The back of the photograph proclaims, "Gypsum Application. Bill Sharpe in photo. Portion of land to left of Bill did not have Gypsum applied. One on right had nearly 5 tons per acre. Before the application this portion of field would not grow anything. The portion where gypsum was not applied was not that bad."

Photograph of Henry Kedding standing in a field both treated and untreated with gypsum. The area has significant Alkali spots deposits from applied gypsum. The back of the photograph proclaims, "Comparison of treated and untreated soil with gypsum. Area in foreground treated with 2 tons of Gypsum per acre in 1956. Area in background untreated."