LETTER OF SUBMITTAL 



Smithsonian Institution, 

 Bureau of American Ethnology, 



Washington, D. C, November 8, 1912. 



Sir: I have the honor to subimt herewith a series of three papers 

 relating to the physiography of the Rio Grande Valley, New Mexico 

 as follows : 



The Rio Grande Valley, by Edgar L. Hewett, Director of the School 

 of American Archaeology. 



Geology and Topography, by Junius Henderson, Professor of 

 Natural History and Curator of the Museum of the University of 

 Colorado. 



Climate and Evidence of Climatic Changes, by Junius Henderson 

 and W. W. Robbins, Assistant Professor of Botany in the Agricultural 

 College of Colorado. 



These are designed to present a somewhat comprehensive view of 

 the environment of the ancient tribes of the upper Rio Grande in New 

 Mexico, especially of the Pajarito Plateau, and of the present Pueblo 

 villages. Tliey form a basis for several papers on the archeology and 

 ethnology of the Rio Grande Valley which will present the results of 

 research conducted jointly by the Bureau of American Ethnology 

 and the School of American Archaeology in 1910 and 1911. It is 

 recommended that the present papers be published as a bulletin of 

 this Bureau. 



Very respectfully, F. W. Hodge, 



Ethnologist in Charge. 



lion. Charles D. Walcott, 



Secretary, Smithsonian Institution. 



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