00551cam a2200193 4500 102482976 TxAuBib 19990827120000.0 990827s1972||||||||||||||||||||||||und|u 72-2243 TxAuBib Olson, Sigurd F. Wilderness Days. Knopf, 1972. 19990827. Histoire naturelle-Guides de plein air. Natural history-Outdoor books. Minnesota Authors.