1933. "Mrs. Vincent P. Ahearn, portrait." Mr. Ahearn was executive secretary of the Industrial Sand Association. Harris & Ewing Collection. View full size.

1919. "Young Women's Christian Association. Scenes at YWCA camp." Harris & Ewing Collection glass negative, Library of Congress. View full size.

Washington circa 1910. "Congress Heights Dramatic Club." Harris & Ewing Collection glass negative, Library of Congress. View full size.

Circa 1920. "Agriculture Department." Cow jumps over moon: astrophysically impossible? Harris & Ewing Collection glass negative. View full size.

1917. "Mrs. Van H. Manning. U.S. Bureau of Mines. Mine rescue methods. There were 750,000 men employed in coal mining in 1915, and of this number 2,264 were killed -- 190 less than in 1914 and 521 less than in 1913. 'This is the most gratifying report the Bureau of Mines has been able to make since it was established,' says Van H. Manning, director of the bureau. 'It indicates very forcibly to me that "safety first" has come to stay in the coal-mining industry.' " Harris & Ewing Collection glass negative. View full size.

1924. "Bureau of Standards. New and improved measuring board for U.S. Children's Bureau." Harris & Ewing Collection glass negative. View full size.

1930. "The hen with the mechanical internal organs surprised visitors at the World's Poultry Congress in London by giving a brief lecture on how she utilized her food to make eggs. Prepared by the United States Department of Agriculture." Harris & Ewing Collection glass negative. View full size.

Washington circa 1917. "State, War & Navy Building, 17th Street and Pennsylvania Avenue." Harris & Ewing Collection glass negative. View full size.

"Treasury, 15th Street and Executive Avenue." A circa 1910 glass negative showing water damage. Harris & Ewing Collection. View full size.

"Interior Department, Bureau of Mines." Another circa 1920 view of research activities at the bureau's Washington offices. Harris & Ewing. View full size.

Circa 1920. "Bureau of Mines, Department of Interior, Washington." Harris & Ewing Collection glass negative, Library of Congress. View full size.

Continuing the Shorpy Group Portrait Weekend, we have this circa 1910 Harris & Ewing glass negative titled "Providence Hospital nurses." View full size.

"Congressional Union for Woman Suffrage, 1916." One of the banners used in a memorial service for Inez Milholland, the lawyer who became a martyr to the suffrage movement following her death from anemia while campaigning for the 19th Amendment. Harris & Ewing Collection glass negative. View full size.

"McKinley School lab." Home economics at McKinley High School in Washington circa 1910. Harris & Ewing Collection glass negative. View full size.

Washington, D.C., circa 1905. "Business High." Harris & Ewing glass negative. View full size.