Thornton, D. <br/><br/>
A soil conservation study in the United States of America. 

 - Dar es Salaam :  Govt. Printer,  1950. 
 - Pamphlet ;  no. 46 .
<br/><br/> At the head of title: Tanganyika. Department of Agriculture. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil conservation -- United States -- Research.--Soil conservation -- United States -- Research.--Soil conservation -- United States -- Research.