Online
A large group of Seymour's negatives from the Spanish Civil War—as well as those of Robert Capa and Gerda Taro—turned up in Mexico in 1995. The "Mexican Suitcase" was acquired by the International Center of Photography in 2007.
http://museum.icp.org/mexican_suitcase/
Children of Europe, UNESCO, 1949, with photos by David Seymour.
http://unesdoc.unesco.org/images/0013/001332/133216eb.pdf
"Somewhere in Europe: A Photographer Highlights the Drama of Post-War Youngsters," UNESCO Courier 2, no. 1 (February 1949), 1, 5–9 [with photos and text by Seymour].
http://unesdoc.unesco.org/images/0007/000739/073912eo.pdf
Homeless Children, UNESCO, 1950, with some photos by David Seymour.
http://unesdoc.unesco.org/images/0013/001337/133713eb.pdf
Bibliography
Beck, Tom. David Seymour (Chim). London and New York, 2005.
Bondi, Inge. Chim: The Photographs of David Seymour. Boston, 1996.
David Seymour—"Chim." New York [1966].
David Seymour, Chim. Valencia, 2003.