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8¢ Wildlife Conservation, Brown Pelican from block of 4 (1972)
1757a-d
13¢ strip of 4 from CAPEX S/S, Cardinal, Mallard, Canada Goose, Blue Jay (1978) ...
For example, the Wildlife Conservation Issue of 1970 (Scott 1392) is said to have a perforation gauge of 11 x10 ½. When referencing perforations, the horizontal perforation gauge is given first, and then the vertical. 2) a tool that ...
One very popular specialty within the stamp collecting community is wildlife conservation and hunting-permit stamps.
The most well-known, at least among United States collectors, is the federal duck stamp.
 See also: Mint, Stamp, Set, Block, Bicolor
  
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