Soil survey of Arecibo area of northern Puerto Rico 
United States Department of Agriculture, Soil Conservation Service ; in cooperation with the College of Agricultural Sciences, University of Puerto Rico, Mayaguez Campus. 
 - Washington, D.C.  Soil Conservation Service  1977. 
 - 169 p.  ill., maps 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils--Maps.--Puerto Rico--Arecibo<br/>Soils--Maps.--Puerto Rico--Arecibo Area<br/>Soil surveys--Puerto Rico--Arecibo Area.