其他書名 | Pt. I. Methods and Appliances for Individual Operators. Pt. II. Placer-mining Districts in Montana. Pt. III. Reported Bar Placers on Missouri River Below Fort Benton |
出版 | Montana School of Mines, 1929 |
URL | http://books.google.com.hk/books?id=COZRAQAAMAAJ&hl=&source=gbs_api |