produced under the auspices of American Geological Institute and National Association of Geology Teachers ; edited by Richard M. Busch ; illustrated by Dennis Tasa
produced under the auspices of the American Geological Institute and the National Association of Geoscience Teachers ; Richard M. Busch, editor ; illustrated by Dennis Tasa ; CD-ROM prepared by Paul J. Morin, Richard L. Sedlock
produced under the auspices of American Geological Institute and National Association of Geoscience Teachers ; edited by Richard M. Busch ; illustrated by Dennis Tasa