Bøger af Ogden Tweto

Ore Deposits of the Gilman District, Eagle County Colorado - This Gold Silver Lead Zinc Copper District was unique for its heavy sulfide deposits containing large quantities of multiple metals. In addition to the metals produced, many world class mineral specimens have also come out of this district. Originally published as USGS Professional Paper 1017, this long out of print book is now available again from Miningbooks.com