| The Canal Zone Study Group |
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| Stamp and Postmark Usage Data |
| Please report additional data for inclusion in these lists. |
| Inventory of dated usage of Type III overprint issues (#46, 47, 48, 67, J10 & J11) |
| Earliest reported dates for handstamped town postmarks Hs-1 through Hs-10 |
| Earliest reported dates for stamp issues on cover or wrapper |
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| Covers from 18th Infantry Brigade (1939-40) needed for Research Project |