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natural resources north america

America's natural places

By Kelly Enright

Lake levels in the Great Lakes

By United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Water Resources and Environment

North American Wildlife Policy and Law

By Bruce D. Leopold,Winifred B. Kessler,James L. Cummins

Wonder of North American agates

By Dan R. Lynch

Turquoise in Mexico and North America

By J. C. H. King