What sources were used to compile the database?
What sources were used to compile the database?
Print Topic
Multiple sources were utilized for each of the manufacturers in our database. The primary sources consist of existing serial number tables, factory production ledgers, material catalogs, wholesale catalogs, printed identification guides, and various online forums. Multiple resources originally compiled by the late Roy Ehrhardt were also used. Our library of original catalogs and publications continues to grow. If you have something that you think would fit in the collection, please let us know.