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Browse more than 160,000 publications authored by our scientists over the past 100+ year history of the USGS.  Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more.

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Filter Total Items: 171126

The evolution of habit in Tempskya

1. The genus Tempskya Corda, of Upper Cretaceous age in western America, is characterized by a markedly dichotomous solenostelic stem system sheathed in a felt of its own adventitious roots. A composite stemlike structure is thus formed which has been termed a false stem. 2. As primary bases for the discussion, it is assumed that the false stem is a composite "organ" analogous to a true stem in ce
Authors
C.B. Read

The Mizpah coal field, Custer County, Montana

No abstract available.
Authors
Frank Stephens Parker, David A. Andrews

The Venericardia planicosta group in the Gulf province

No abstract available.
Authors
Julia Gardner, Edgar Bowles

Transit traverse in Missouri, 1900-1937. Part 1, Southeastern Missouri, 1903-37

This bulletin, which for convenience is to be published in eight parts, contains the results of all transit traverse* done In Missouri through 1937 by the Geological Survey, United States Department of the Interior, including those heretofore published. (See page X.) Each of the parts deals with one of eight sections into which the State has been divided for this purpose and which have been design
Authors
John G. Staack

Water levels and artesian pressures in observation wells in the United States in 1938

No abstract available.
Authors
O. E. Meinzer, L.K. Wenzel

Water utilization in the basin of South Umpqua River, Oregon

No abstract available.
Authors
R.O. Helland

The significance and nature of the cone of depression in ground-water bodies

In nature the hydraulic system in an aquifer is in balance; the discharge is equal to the recharge and the water table or other piezometric surface is more or less fixed in position. Discharge by wells is a new discharge superimposed on the previous system. Before a new equilibrium can be established water levels must fall throughout the aquifer to an extent sufficient to reduce the natural discha
Authors
Charles V. Theis

Sulphate minerals of the Comstock Lode, Nevada

Seventeen representative samples of supergene sulphates from old workings on the Comstock Lode are described. They range from simple minerals such as gypsum and epsomite to complex aggregates of four or more distinct species. All are well known species except a mineral of the copper (chalcanthite) or magnesium sulphate pentahydrate group, with about half the magnesium replaced by copper, zinc, fer
Authors
C. Milton, W. D. Johnston

Dolomite and jasperoid in the Metaline District, northeastern Washington

The replacement ore bodies of the Metaline zinc-lead district, in northeastern Washington are limited to the greatly disturbed fault block through which the Pend Oreille River flows and are associated with the major faults but are not in them. They are mostly near the top of the Metaline limestone, of Middle Cambrian age, and below black Ordovician slate. The ores are generally in jasperoid and ar
Authors
Charles Frederick Park

Mediterranean sediments and pleistocene sea levels

No abstract available. 
Authors
W.H. Bradley

Two home-made traps for English sparrows

No abstract available.
Authors

Botulism, a recurring hazard to waterfowl: with notes on recent outbreaks in the United States and Canada, and Australia

No abstract available.
Authors
E.R. Kalmbach