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by Unknown
by Hamblin, W. Kenneth; Howard, James D
by Gardiner, Greg P.; Wilcox, Susan
by American Geological Institute, AGI; NAGT - National Association of Geoscience Teachers; Cronin, Vincent; et al.
by Robert Darling, Gayle Gleason and Li Jin
by Plummer
by American Geological Institute
by ZUMBERGE
by Sinclair College