• Hofsommer, Don L.
• Slaton, Amy E.
• Kirby, Jack Temple
• Lewis, Michael
• Stoll, Mark R.
• Stoll, Steven
• Miller, Angela
• Miller, Char
• Sutter, Paul S.
• Conte, Christopher
• Worster, Donald
• Lewis, Michael L.
• Perreault, Melanie
• Dean, Bradley P.
• Johnson, Benjamin
• Jarvis, Kimberly A.
• Harvey, Mark
• Turner, James Morton
• Sackman, Douglas Cazaux
• Graham, Alan
• Monson, Charles
• Lykins, Lisa Dianne
• Hamilton, David E.
• Richard C. Carpenter
• Grant, H. Roger
• Jackson, Robert W.
• Gary M. Kroll
• Mitman, Gregg
• Vileisis, Ann
• McCann, Joy
• Andrews, Thomas
• Hedquist, Seth
• Tigges, John
• Schaffer, James
• Mathieu, Jon

• Environmental history
• Natural history
• Railroads
• Land transportation
• Nature and its relationship to culture; human-nature relationships
• Nature
• Environmentalism
• Natural resource management
• Conservation of natural resources
• Botany
• Railroads, Interurban
• African Americans and science
• Biology
• African Americans
• Students
• Science and race
• Laboratories
• Identity
• Environmental sciences
• Forests and forestry
• Science and art
• Geology
• Ecology
• Fossils
• Corals
• Earth sciences
• Reefs
• Popularization
• Disease and diseases
• Therapeutic practice; therapy; treatment
• Tuberculosis
• Hospitals and clinics
• Maps; atlases
• Street-railroads
• Bridges
• Bridge--Design and construction
• Photographs
• Bridges, Railroad
• Industrial archaeology
• Artifacts
• World War II
• Marine ecology
• Fisheries; fishing
• Abalones
• Marine biology
• Oceanography
• Oceans and seas
• Historiography
• Drama, dance, and performing arts
• Performance; demonstration
• Agriculture
• Music
• Railroads, Narrow Gauge
• Pictorial works
• Illustrations
• Explorers and Exploration
• Field work
• Travel; exploration
• Deserts
• Field notes

• Carver, George Washington
• Pinchot, Gifford
• Muir, John
• Agassiz, Jean Louis Rodolphe
• Humboldt, Alexander von

• United States
• Iowa (U.S.)
• Southern states (U.S.)
• South America
• North America
• Minnesota (U.S.)
• Mississippi River (North America)
• Illinois (U.S.)
• Americas
• Oceanic Islands
• California (U.S.)
• Western states (U.S.)
• Rocky Mountains (U.S.)

• Iowa State College, Ames
• United States. National Park Service
• Burlington, Cedar Rapids, and Northern Railway Company of Iowa

• 20th century
• 19th century
• 18th century
• 20th century, early
• 21st century

• University of North Carolina Press
• Oxford University Press
• Wiley-Blackwell
• University of Chicago Press
• Kentucky, University of
• The Johns Hopkins University Press
• Central Electric Railfans' Association
• University of Oklahoma
• Indiana University Press
• Oregon State University Press
• NewSouth Books
• Harvard University Press
• Arcadia Publishing
• Brill

• Railroad History
• History and Technology
• Earth Sciences History: Journal of the History of the Earth Sciences Society
• IA. The Journal of the Society for Industrial Archeology
• Agricultural History

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