APP 18 191" 

 GIFT 



Issued March 22, 1912. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF SOILS CIRCULAR No. 52 

 MILTON WHITNEY, Chief of Bureau. 



SOILS OF THE SAN LUIS VALLEY, 

 COLORADO. 



MACY H. LAPHAM, 



Scientist in Soil Survey. 



j 



WASHINGTON: 

 GOVERNMENT PRINTING OFFICE. 



1912. 



