TY  - BOOK
AU  - Briggs,Reginald P.
ED  - United States
TI  - Changes in stratigraphic nomenclature in the cretaceous system east-central Puerto Rico
U1  - 551.7 
PY  - 1969///.
CY  - Washington: 
PB  - United States Government Printing Office, 
KW  - Geology, Stratigraphic
KW  - Catalogue
KW  - Puerto Rico
N1  - Prepared in cooperation with the Commonwealth of Puerto Rico Economic Development Administration, Industrial Research Department; Includes bibliographical references (p. O29-O31)
ER  -