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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.

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Browse almost 1,000 books authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.

Filter Total Items: 971

Seasonal Influence of Nutrients on the Physiology and Behavior of Captive Canvasbacks (Aythya valisineria)

Captive canvasbacks (Aythya valisineria) were maintained ad libitum on five diets during the winters of 1978-79 and 1979-80 to evaluate the effects of varying protein and energy levels on feed intake and condition. Diets were formulated to simulate either a natural diet high in invertebrates or one high in vegetation. Two diets low in protein and energy simulated stress diets. Feed intake durin
Authors
M. C. Perry
By
Ecosystems Mission Area, Eastern Ecological Science Center

Temporal dynamics of an estuary: San Francisco Bay

No abstract available.
By
San Francisco Bay and Sacramento-San Joaquin Delta Estuary

Guidebook for the annual field conference of Pennsylvania geologists: Geology of an accreted terrane; the eastern Hamburg Klippe and surrounding rocks, eastern Pennsylvania

No abstract available.
Authors
Peter T. Lyttle, Jack B. Epstein, Gary George Lash
By
Florence Bascom Geoscience Center

Bibliography of alluvial-fan deposits

No abstract available.
Authors
T. H. Nilsen, Thomas E. Moore
By
Energy and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Measuring resource potential for river recreation

No abstract available.
Authors
J.A. Fritschen, Robert T. Milhous, J. Nestler

A field test of a winter pronghorn habitat suitability index model

No abstract available.
Authors
J.G. Cook, Arthur W. Allen, M.J. Armbruster, L.L. Irwin

The physical habitat simulation system for instream flow studies

No abstract available.
Authors
Robert T. Milhous

Research gaps in assessing wetland functions

No abstract available.
Authors
J.H. Sather, P.J. Stuber

Accessioning and cataloguing

No abstract available.
Authors
D.E. Wilson

Third report to the fish farmers : the status of warmwater fish farming and progress in fish farming research

No abstract available.
Authors
Huner Jay V. Dupree H. K.
By
Ecosystems Mission Area, Eastern Ecological Science Center

Guide to the Bedrock Geology of a traverse of the Chugach Mountains from Anchorage to Cape Resurrection

No abstract available.
Authors
Gary R. Winkler, Marti L. Miller, R.B. Hoekzema, Julie A. Dumoulin
By
Ecosystems Mission Area, Groundwater and Streamflow Information Program, Alaska Science Center

Isolation of organic acids from large volumes of water by adsorption chromatography

The concentrations of dissolved organic carbon from most natural waters ranges from 1 to 20 milligrams carbon per liter, of which approximately 75 percent are organic acids. These acids can be chromatographically fractionated into hydrophobic organic acids, such as humic substances, and hydrophilic organic acids. To effectively study any of these organic acids, they must be isolated from other org
Authors
George R. Aiken