SEIDERS, Victor <br/><br/>
Cretaceous and Lower Tertiary Stratigraphy of the Gurabo and El Yunque Quadrangles, Puerto Rico / 
By Victor M. Seiders. 
 -- Washington :   United States Government printing Office,   1971 
 - 58 p. + 1 map. pleg. -- 
 (Geological Survey Bulletin  ;  1294-F).
<br/><br/> Fecha real de registro 09-03-1972 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cretácico<br/>Puerto Rico<br/>Terciario
<br/><br/><label>Universal Decimal Class. No.: </label>551.763(729.5)