TY  - RPRT
TI  - A reconnaissance study of the beach sands of Puerto Rico
AU  - Robert B. Guillou
AU  - Jewell J. Glass
PY  - 1957
DO  - 10.3133/b1042i
UR  - https://pubs.usgs.gov/publication/b1042I
ID  - b1042I
ER  -