TY  - RPRT
TI  - Historical Shoreline Changes in Puerto Rico, 1901-1987
AU  - E.R. Thieler
AU  - W. W. Danforth
PY  - 1993
DO  - 10.3133/ofr93574
UR  - https://pubs.usgs.gov/publication/ofr93574
ID  - ofr93574
ER  -