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1.

Geology and Earth Sciences Sourcebook for Elementary and Secondary Schools

Geology and Earth Sciences Sourcebook for Elementary and Secondary Schools by Heller, Robert Leo ISBN: 9781258236878 List Price: $60.95

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2.

Geology and Earth Sciences Sourcebook for Elementary and Secondary Schools

Geology and Earth Sciences Sourcebook for Elementary and Secondary Schools by Heller, Robert Leo ISBN: 9781258244453 List Price: $45.95