Colorized version of the Currin Grocery in Granville County, North Carolina, photographed by Dorothea Lange in July 1939. View full size.

"Grace & Sally -- 18 Sept 1951." Minnesota Kodachromes at home in Blue Earth. 35mm color slide by Hubert Tuttle. View full size.

January 20, 1921. Washington, D.C. "American Forestry Association bird house contest." Back when ornithology was something a boy picked up on the streets. National Photo Company Collection glass negative. View full size.

Circa 1910. "Hotel Halcyon and Avenue B looking north -- Miami, Fla." 8x10 inch dry plate glass negative, Detroit Publishing Company. View full size.

July 1939. Granville County, N.C. "Country filling station owned and operated by tobacco farmer." Our second look at this establishment offering combustibles and comestibles. Medium format negative by Dorothea Lange. View full size.

July 1939. "Siler City, North Carolina." Resting place of Aunt Bee. Photo by Dorothea Lange for the Farm Security Administration. View full size.

July 1939. Granville County, North Carolina. "Country filling station owned and operated by tobacco farmer. Such small independent stations have become meeting places and loafing spots for neighborhood farmers in their off times." Photo by Dorothea Lange for the Farm Security Administration. View full size.

Circa 1903. "Unloading bananas at New Orleans." Final installment of a thrilling trilogy we've watched unfold here over the past three years. 8x10 inch dry plate glass negative, Detroit Publishing Company. View full size.

December 1942. "Chicago, Illinois. In the Chicago & North Western locomotive repair shops." Photo by Jack Delano, Office of War Information. View full size.

"Elwin asleep - 11 April 1952." This outtake from Minnesota Kodachromes was evidently deemed worth saving despite the photographer's being at the end of his roll. 35mm color transparency by Hubert Tuttle. View full size.

Circa 1915. "Steamer Panama at Pedro Miguel Locks, approach from Miraflores Lake, Panama Canal." Another high-resolution view to mark the centenary of the Panama Canal. 8x10 inch glass negative, Detroit Publishing Co. View full size.

April 1939. "Salvation Army, San Francisco, California. At Minna Street the army forms a semicircle, girls' Sunday school class sings between preaching to attract a crowd." Medium format negative by Dorothea Lange. View full size.

Washington, D.C., circa 1940. "Cafritz, Morris, Mrs." A leader in both parties and philanthropy, Gwendolyn Cafritz was the Hungarian-born wife of real estate developer Morris Cafritz. Harris & Ewing glass negative. View full size.

Circa 1915. "Bolton Castle in Gatun Locks, west chamber, Panama Canal." Just the thing to float your boat. 8x10 inch dry plate glass negative. View full size.

"Panama Canal excavation, 1913." The world's most celebrated shortcut marks its centennial this month. Copy negative; Harris & Ewing glass plate. View full size.