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1.

雑誌
雑誌
1. National parks
National Parks and Conservation Association
出版情報: Washington, D.C. : National Parks & Conservation Association, 1981-
巻次(年次): Vol. 55, no. 1 (Jan. 1981)-
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2.

雑誌
雑誌
2. National parks & conservation magazine : the environmental journal
National Parks and Conservation Association
出版情報: Washington, D.C. : National Parks & Conservation Association, 1970-c1980
巻次(年次): Vol. 44, no. 271 (Apr. 1970)-v. 54, no. 12 (Dec. 1980)
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