Key to the photographic interpretation of Philippine agricultural crops 

 - Quezon City :  PROS,  [197-n] 
 - [25] p. :   ill. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Photography, Agricultural--Philippines--20th century.<br/>Photography--Crops--Philippines--20th century.<br/>Farm life--Pictorial works.--Philippines--20th century