TY - BOOK AU - United States. National Park Service. Division of Audiovisual Arts AU - National Audiovisual Center TI - Kolb and the canyon PB - The Service : Distributed by National Audiovisual Center PY - 1989 EP - 1 videocassette (14 min.) UR - https://ci.nii.ac.jp/ncid/BA29512369 ER -

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