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Stamps,
4th National Engineers' Congress
issue
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1 to 2 of 2
El Salvador
postage
1978
, Sep 12
4th National Engineers' Congress issue
unwmk
(no perf info)
-
10c
multi
airmail
1978, Sep 12
4th National Engineers' Congress issue
-
25c
multi
1 to 2 of 2