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Stamps of
United States
, 29 Apr 1982
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1 to 4 of 4
postage
1982
, Apr 29
Knoxville World's Fair issue
unwmk
p.
11
X
20c
multi
solar energy
X
20c
multi
synthetic fuels
X
20c
multi
breeder reactor
X
20c
multi
fossil fuels
1 to 4 of 4