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Postal Markings — HandbooksHelbock, Richard W. POSTMARKS ON POSTCARDS; AN ILLUSTRATED GUIDE TO EARLY TWENTIETH CENTURY UNITED STATES POSTMARKS. Published 1987. Card. 248 p. Illus. Introduction, chapters on Circular date stamps; Doane pmks.; Four-bar pmks.; Metal duplex; Manuscript; Straightline; Machine; Varieties. Good section on collecting postmarks. Several PO lists in appendix.Literature #405 | Price: $15.00 | Your Price: $12.00 Qty: 1