LETTER OF TRANSMITTAL. 



U. S Department or Agricitlture, 



Bureau of Soils, 

 Washington, D. 6'., DeceTriher 15, 1919. 

 Sir: I have the honor to transmit herewith the manuscript report 

 and map covering the survey of the Middle Gila Valley Area, 

 Arizona, and to recommend that they be published as advance sheets 

 of Field Operations of the Bureau of Soils, 1917, as authorized by 

 law. 



Respectfully, 



Milton Whitney, 



Chief of Bureau, 

 Hon. D. F. Houston, 



Secretary of Agriculture, 



