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1
Instructor s manual Earthwatch : Answer key / Susan Stempleski.
New Jersey : Prentice Hall Regents, 1994.
41 p. ; 22 cm.
2
Instructor s manual focus on the environment : Answer key and video transcripts / Susan Stempleski.
Englewood Cliffs, NJ : Prentice Hall, cop., 1993.
59 p. ; 22 cm.