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Stamps,
international congresses
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Russia
postage
1968
, May 30
international congresses
unwmk
p.
12
X
6k
multi
oils
X
6k
multi
c.energy
1968, May 30
8th Congress for Mineral Research issue
-
international congresses
X
6k
multi
crystal
1968, May 30
13th Entomological Congress issue
-
international congresses
X
6k
multi
Carabus schoenherri
Emblem of 13th Entomological Congress
1 to 4 of 4