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History
3
Description and travel
2
Canyons
1
Dams
1
Discovery and exploration
1
Environmental conditions
1
Geography
1
Geological Survey (U.S.)
1
Geological surveys
1
Macomb, J. N.
1
Paleontology
1
Political aspects
1
River surveys
1
Scientific expeditions
1
Travel
1
United States
1
Water resources development
1
Water-supply
1
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1por Boyer, Diane E.Materias: “…Geological Survey (U.S.) History 20th century…”
Publicado 2007
Libro electrónico -
2por Madsen, Steven K.Materias: “…Geological surveys Four Corners Region History 19th century…”
Publicado 2010
Libro electrónico -
3