November 18, 1924. Washington, D.C. "Debutantes of Columbia Hospital Benefit Committee." National Photo Company Collection glass negative. View full size.

March 16, 1915. "Washington Asylum Hospital." Nat'l Photo Co. View full size.

"Nurse, 1922." National Photo Co. Collection glass negative. View full size.

Circa 1918. "National War Garden Commission. Vigo County Canning Clubs." Indiana "farmerettes" at a War Garden exhibit in Washington. View full size.

"Schneider electric store." C. Schneider's Sons in Washington, D.C., circa 1929. ("Give her an Electric Grill for Xmas.") Harris & Ewing glass neg. View full size.

Washington, D.C., circa 1927. "Thomas R. Shipp group, Hamilton Hotel. Atwater Kent standing by radio." National Photo Co. safety negative. View full size.

Washington, D.C., circa 1919. "Times. 1701 Ninth Street N.W." A different perspective on the block seen here. Note the odd hydrant similar to the one on this street. National Photo Company Collection glass negative. View full size.

Circa 1865. "City Point, Virginia (vicinity). Medical supply boat Planter at General Hospital wharf on the Appomattox." Wet plate glass negative. View full size.

Washington, D.C., circa 1915. "Miss Elsie Walker." Whose fetching features are only enhanced by her chic chapeau. Harris & Ewing. View full size.

September 1938. "Coal miner's children and wife, Pursglove, West Virginia." 35mm nitrate negative by Marion Post Wolcott for the FSA. View full size.

1942 or 1943. "Gilead, Ohio (?), possibly Mount Gilead" is the uncertain caption. Although the photo does provide a few clues. 35mm Kodachrome transparency by John Vachon for the Farm Security Administration. View full size.

UPDATE: A couple of astute commenters have identified this as a building on Main Street in Mount Orab, Ohio. Google Street View gives a pretty good match. If there are any Shorpyite shutterbugs in Mount Orab, hie on over to the intersection of Main and High, send us some pics and help us lay to rest a mystery that's been bedeviling the Library of Congress for the past 65 years!

City Point, Virginia, circa 1865. "Rear view of General Grant's headquarters." Photos from the main Eastern theater of war, the siege of Petersburg, June 1864- April 1865. Wet plate glass negative, photographer unknown. View full size.

"Miss Adrianne Henderson, 1939." Harris & Ewing glass negative. View full size.

"Hancock's, the Old Curiosity Shop, 1234 Pennsylvania Avenue," probably around 1914, the final year of its existence. The restaurant, the Washington Post reported in 1927, "was noted particularly for two things -- its cocktails and its fried chicken." Harris & Ewing Collection glass negative. View full size.

New York, February 1912. "The breaking point. A heavy load for an old woman. Lafayette Street below Astor Place." Photo by Lewis Hine. View full size.