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Earth

GEO Tarbuck, Edward J. Earth. Prentice-Hall, 1996.
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Over the hill and down the creek

GEO Youngquist, Walter Over the hill and down the creek. Caxton, 1966
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The gold discovery: James Marshall and the California gold rush

GOLD Dillinger, William C. The gold discovery: James Marshall and the California gold rush. California Department
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The Gold Information Center

GOLD The Gold Information Center. Man and his gold. 1984
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