Platt, Robert S. <br/><br/>
Field study in american geography :  the development of theory and method exemplified by selections. 

 - Chicago :  University of Chicago,  1959. 
 - 405 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>AGRICULTURA<br/>ESTADOS UNIDOS<br/>GEOGRAFIA<br/>GEOGRAFIA POLITICA<br/>MAPAS<br/>RIOS
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>GEOGRAFIA