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Harper's Encyclopedia of United States History (ed. Benson Lossing) 332 0 Browse Search
Abraham Lincoln, Stephen A. Douglas, Debates of Lincoln and Douglas: Carefully Prepared by the Reporters of Each Party at the times of their Delivery. 110 0 Browse Search
Horace Greeley, The American Conflict: A History of the Great Rebellion in the United States of America, 1860-65: its Causes, Incidents, and Results: Intended to exhibit especially its moral and political phases with the drift and progress of American opinion respecting human slavery from 1776 to the close of the War for the Union. Volume I. 68 0 Browse Search
Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories 32 0 Browse Search
Edward L. Pierce, Memoir and letters of Charles Sumner: volume 3 28 0 Browse Search
Edward L. Pierce, Memoir and letters of Charles Sumner: volume 4 24 0 Browse Search
Edward Alfred Pollard, The lost cause; a new Southern history of the War of the Confederates ... Drawn from official sources and approved by the most distinguished Confederate leaders. 22 0 Browse Search
Jefferson Davis, The Rise and Fall of the Confederate Government 20 0 Browse Search
Francis Jackson Garrison, William Lloyd Garrison, 1805-1879; the story of his life told by his children: volume 3 20 0 Browse Search
C. Edwards Lester, Life and public services of Charles Sumner: Born Jan. 6, 1811. Died March 11, 1874. 20 0 Browse Search
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Browsing named entities in Elizabeth Cary Agassiz, Louis Agassiz: his life and correspondence, third edition. You can also browse the collection for Nebraska (Nebraska, United States) or search for Nebraska (Nebraska, United States) in all documents.

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Elizabeth Cary Agassiz, Louis Agassiz: his life and correspondence, third edition, Chapter 21: 1865-1868: Aet. 58-61. (search)
ld and artificial theories, I can wait a little till the changes which succeeded that epoch are also understood. I have obtained direct proof that the prairies of the West rest upon polished rock. It has happened in the course of recent building on the prairie, that the native rock has been laid bare here and there, and this rock is as distinctly furrowed by the action of the glacier and by its engraving process, as the Handeck, or the slopes of the Jura. I have seen magnificent slabs in Nebraska in the basin of the river Platte. Do not the physicists begin to think of explaining to us the probable cause of changes so remarkable and so well established? We can no longer evade the question by supposing these phenomena to be due to the action of great currents. We have to do first with sheets of ice, five or six thousand feet in thickness (an estimate which can be tested by indirect measurements in the Northern States), covering the whole continent, and then with the great current