Alpaca and vicuña at National Zoological Park, circa 1910s.

Infant gorilla "Tomoka" while fostered at home of Bernard F. Gallagher, supervisory keeper for great apes at National Zoological Park, and his wife, Louise E. Gallagher, 1962.

Stereograph of Increase Allen Lapham (1811-1875), known as the "Father of the U.S. Weather Service," examining a fragment of a 33 lb. meteorite found in Trenton, Washington County, Wisconsin in 1871, by Hugo Broich.

Carte-de-visite of James Law (1838-1921), first veterinary professor at an American university, by Purdy & Frear.

Cyanotype, Camp F.L. Guenther, U.S. Coast Artillery at the Pan-American Exposition, Buffalo, New York, 1901.

A proud mother responded to news service’s request for a photograph of her physicist-son killed during World War I.

Drawing of "Neptune Baird," dog belonging to Spencer Fullerton Baird, second Secretary of the Smithsonian Institution, circa 1840s.

Cyanotype, disassembled mannequins in Post Office Department exhibit at Cotton States Exposition, Atlanta, 1895.

Cyanotype, Department of Agriculture exhibit at the Pan-American Exposition, Buffalo, New York, 1901.

A 1936 exchange of letters about the prickly porcupine preserves both a contemporary scientific debate and the wit and wisdom of a young Utah girl with a beloved pet.