LETTER OF TRANSMITTAL. 



U, S. Department of Agriculture, 



Bureau of Soils, 

 Washington, D. C, June 12, 1920. 

 Sir: In the extension of the soil survey in the State of Iowa 

 during the field season of 1918 a survey was undertaken in Louisa 

 County. This work was done in cooperation with the Iowa Agri- 

 cultural Experiment Station, C. F. Curtiss, Director. 



I have the honor to transmit herewith the manuscript report and 

 map covering this work and to request their publication as advance 

 sheets of Field Operations of the Bureau of Soils for 1918, as author- 

 ized by law. 



Respectfully, 



Milton Whitney, 



CJiief of Bureau. 

 Hon. E. T. Meredith, 



Secretary of Agriculture. 

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