Civilian Conservation Corps
The Civilian Conservation Corps Legacy website provides basic lists by CCC company number, project numbers, and locations.
The The Living New Deal website provides useful historical information about the New Deal programs and descriptions of CCC projects by state. It has a map to locate the hundreds of CCC sites around the United States.
Paul Manderscheid wrote the standard reference for CCC tokens as article for the National Token Collectors Association. His reference is called “Listing of Known Civilian Conservation Corp Camp Tokens and Camp Locations.” If you join the association, you can download the article in PDF format.
This Wikipedia article also has background information on the Civilian Conservation Corps.
Wikipedia has a good overview of the canal.
The TokenCatalog.com website provides a large catalog of tokens from the United States and around the world.