Civilian Conservation Corps Uniform Handbook - Erik Ledbetter
By far the most comprehensive resource on uniforms and equipment used by the Civilian Conservation Corps, published by the late Erik Ledbetter. His site also has an introductory buyers guide for someone wishing to interpret the CCC.
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Happy Days CCC Newspaper - NARA
Individual Enrollee Records - NARA
CCC Camp Newspapers - The Ancestor Hunt
1933-34 Eugene District Photo Album - Oregon Historical Society
Camp Twin Buttes photos - Washington Rural Heritage