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You can make a difference : , help protect the earth / by Getis, Judith, Publication: Dubuque, IA : Wm. C. Brown Publishers, 1991 . vi, 88 p. ; 23 cm. Date:1991 Availability: Copies available: AUM Main Library (1),
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Earth science and the environment / by Thompson, Graham R. Publication: Fort Worth, TX : Saunders College Pub., 1993 . xv, 622, 16, [4] 19, 9 p. : 28 cm. Date:1993 Availability: Copies available: AUM Main Library (1),
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