1968 Sc 3602-3604. Soviet Geology. Scott 3527-3529

$1.50

1968. Soviet Geology.
Catalog numbers: Scott 3527-3529, Standard Collection 3602-3604, Michel 3552-3554, Yvert 3422-3424.
Perforation: comb 11½.
Color: Multicolor.
Printing: Offset lithography.
Print run: 4,000,000; 3,000,000; 3,000,000.

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SKU: SU 3602-3604