Canal Zone Postage Stamps, Permanent, Provisional and Temporary Series, Fourth Edition-1939, MR 64588 Panama Canal 5-1-39. Only 5000 issued. Includes extensive write-ups of 105-114, 120-35, C7//C14, C15-C20, and J25-J28. 23 Pages. Some mild toning otherwise Very Fine. Nice Official Guide.