TY  - BOOK
ED  - Puerto Rico.
TI  - Río Piedras watershed sanitary quality survey
PY  - 1970///
CY  - [n.p.]
PB  - s.l.
KW  - Water
KW  - Pollution
KW  - Local
KW  - Watersheds
KW  - Puerto Rico
N1  - Mimeographed
ER  -