Stamps, 31c denom
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United States
postage1976, May 29 Interphil sheets issue - Washington Reviewing His Ragged Army at Valley Forge, by William T. Trego unwmk p. 11 (5 stamps)
| - | 31c | multi | Two Officers | |||
| - | 31c | multi | Washington | |||
| - | 31c | multi | Officer Black Horse | |||
| - | 31c | multi | Officer White Horse | |||
| - | 31c | multi | Three Soldiers |
airmail
1976, Jan 2 1976 air issue
| X | 31c | ultra & red & blk | head-on plane & globes on flag |
1978, Sep 23 Wright brothers issue
| X | 31c | ultra & multi | flyer A | |||
| X | 31c | ultra & multi | Orville and Wilbur Wright & Wright Flyer |
1979, Sep 5 Olympics 1980 issue
| X | 31c | multi | high jumper |
Marshall Islands
postage2005, Jan 20 Presidents of the United States issue - Presidents of the United States (2005) (no perf info)
| - | 31c | multi | Herbert Hoover | — | — |
United Nations
1957, Oct 24 Security Council issue
| - | 31c | multi |
1976, Apr 23 U.N. Conference on Trade and Development 1976 issue
| - | 31c | multi |
1976, Oct 8 25th Anniversary of U.N. Postal Administration issue
| - | 31c | multi |
1977, Mar 11 World Intellectual Property Organization Headquarters issue
| - | 31c | multi |
1978, Mar 31 Global Eradication of Smallpox issue
| - | 31c |
1978, Nov 17 Technical Co-operation among Developing Countries issue
| - | 31c | multi |
1979, May 4 International Year of the Child issue
| - | 31c | multi | — | — |
1979, Oct 5 Namibia 1979 issue
| - | 31c | multi |
1980, Jan 11 New International Economic Order issue
| - | 31c | multi |
1980, May 16 peacekeeping operations issue
| - | 31c | multi | arrows |
1980, Jun 26 UN 35th issue
| - | 31c | multi |
1981, Apr 15 Art issue
| - | 31c | multi | "Sebastocrator Kaloyan and his Wife" |
airmail
1977, Jun 27 1977 air issue
| - | 31c | multi |
Canal Zone
1951, Jul 16 1951 airmail issue p. 11
| - | 31c | cer | wing & globe |
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