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123 1 $aa$b1:7460000$do1500000$eo0500000$fn0831000$gn0414000
200 1 $aCanada$bDocumento cartografico$fcompiled and drawn in the Cartographic Division of the National Geographic Society for the National Geographic Magazine$gGilbert M. Grosvenor, editor$gWilliam T. Peele, chief cartographer
206   $a1:7460000 (O150°-O50°/N83°10'-N41°40')
210   $aWashington$cNational Geographic Society$d1953
215   $a1 carta$ccolor., ripieg.$d55 x 77 cm
300   $aSuppl.: The National Geographical Magazine, v. 141, n. 3
300   $aSul retro del foglio grande immagine: Ice age mammals of the Alaskan tundra
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712 02$aNational Geographic Society
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