The United States Transit Markings Catalog 1837 To 1974 by Charles L. Towle
Mounted in two loose leaf notebooks
Volume 1 - The United States Transit Markings Catalog 1837 To 1974
Volume 2 - The United States Transit Markings Catalog 1837 To 1974
Volume 3 - Added to the back of Volume 2 (1981)
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Great resource for US transit cancels
Don