TY  - RPRT
TI  - Composition of Pacific Ocean ferromanganese nodules
AU  - David Z. Piper
AU  - M.E. Williamson
PY  - 1977
DO  - 10.1016/0025-3227(77)90036-6
UR  - https://pubs.usgs.gov/publication/70208057
ID  - 70208057
ER  -