Stamps of Mongolia, not overprinted, missing width
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airmail
1977, Jun 20
11th Anniversary of Intercosmos issue unwmk
1977, Dec 20
History of Airships and Balloons issue (8 stamps)
1978, Mar 25
75th Anniversary of Powered Flight issue (8 stamps)
1978, May 29
CAPEX '78 issue (no perf info)
1978, Jul 28
11th World Youth Festival issue p.
12
1978, Sep 5
PRAGA '78 issue (no perf info)
1979, Oct 9
30th Anniversary of German Democratic Republic issue p.
11.5x12
1979, Oct 25
birds (1979 Mongolia) (no perf info) (7 stamps)
1980, Aug 4
World Aerobatic Championship issue (8 stamps)
1980, Sep 15
Olympics 1980 Gold Medal Winners issue
1981, Oct 5
50th Anniversary of "Graf Zeppelin" Polar Flight issue (8 stamps)
1982, Sep 27
I.T.U. Delegates' Conference issue p.
12
1982, Dec 15
Second U.N. Conference on the Exploration and Peaceful Uses of Outer Space issue
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