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The National Atlas Online
I really haven't inspected anything here very closely yet, but it
includes map layers such as: Geology, Mineral Operations of all kinds, and
Volcanoes. They want you to subscribe, but you can try it for free.
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The Idaho Digital Atlas
Spearheaded by a number of people in the ISU geology department,
this is an excellent resource for geology, biology, geography, and
other good things. It's really quite good . . . an excellent resource for
teachers.
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