TY - RPRT TI - Bottom sediment types of the northern insular shelf of Puerto Rico; Punta Penon to Punta Salinas AU - O. H. Pilkey AU - D. M. Bush AU - R. W. Rodriguez PY - 1987 DO - 10.3133/i1861 UR - https://pubs.usgs.gov/publication/i1861 ID - i1861 ER -