TY - BOOK ID - 127128192 TI - The porphyry coppers in 1956 PY - 1957 PB - New York, N.Y.: American institute of mining, metallurgical and petroleum engineers, DB - UniCat KW - Copper mines and mining KW - Copper mines and mining KW - Porphyry UR - https://www.unicat.be/uniCat?func=search&query=sysid:127128192 AB - ER -