Stamps of United States - Canal Zone, 17 base day
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postage
1948, Apr 17 (no wmk info) (no perf info)
| - | 10c |
1957, Nov 17 Gorgas Hospital 75th issue unwmk p. 11
| - | 3c | blk, blgrn | Gorgas Hospital administration building |
airmail
1963, Aug 17 (no wmk info) (no perf info)
| X | 15c | Alliance for Progress emblem |
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