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Stamps of
United States
, 17 May 1991
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1 to 2 of 2
postage
1991
, May 17
unwmk
p.
10
-
19c
multi
balloon
airmail
1991, May 17
William T. Piper issue
p.
11
-
40c
multi
William T. Piper
&
Piper Cub
1 to 2 of 2