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Publication Extents

Not all publications have extents, not all extents are completely accurate
Boundaries, areas, geographic centers and altitudes of the United States and the several States with a brief record of important changes in their territory
Edward M. Douglas
1923, Bulletin 689
Boundaries between countries are established by treaties made by the sovereign powers concerned.A boundary between two States of the United States may be changed by agreement of the State legislatures, but this agreement must be approved by Congress. The United States Congress can not change a State boundary without the...
Additions to the flora of the Wilcox group
Edward Wilber Berry
1923, Professional Paper 131-A
A rather full account of the extensive flora contained in the lower Eocene strata of the Mississippi embayment which are referred to the Wilcox group was published in 1916. At that time it was not possible to obtain sections of the numerous specimens of petrified wood that had been collected...
The shapes of beach pebbles
Chester K. Wentworth
1923, Professional Paper 131-C
There is much confusion in geologic literature as to the shapes of fluvial and beach pebbles and the differences between them, if differences exist. Though the contrary has been asserted, most geologists who have written on the subject appear to hold the view that beach pebbles are generally flatter than...
A section of the Paleozoic formations of the Grand Canyon at the Bass trail
L. F. Noble
1923, Professional Paper 131-B
The thick series of horizontal strata of Paleozoic age which makes the greater part of the wall of the Grand Canyon is probably broadly familiar to more people than the strata exposed in any other area in the western United States. Each detail of form or color in the wall...