THE PRINCIPLES OF STRATIGRAPHY 



By AMADEUS W. GRABAU, S.M., S.D. 



Professor of Palaeontology in Columbia University 



"This monumental work will be of great value especially to the 

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 supplements but does not supplant them." — Science, July 14, 1914. 



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An Introduction to Geology. By J. E. Marr, Sc.D., President of the Geological 

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The Principles of Stratigraphical Geology. By J. E. Marr, Sc.D., F.R.S., F.G.S. 



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The Geology of the Lake District, and the Scenery as influenced by Geological Struc- 

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Agricultural Geology. By R. H. Rastall, M.A., late Fellow of Christ's College and 

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Petrology for Students: an introduction to the study of rocks under the microscope. 

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A Treatise on Crystallography. By W. J. Lewis, M.A., Professor of Mineralogy in 

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