1 - 25 of 2
| Title | Date | Type | ||
|---|---|---|---|---|
| 1 |
 |
Time studies in underground coal mining | 1964-06 | Text |
| 2 |
 |
Study of various coal mines in Utah, Colorado, and Wyoming | 1950-05 | Text |
1 - 25 of 2
| Title | Date | Type | ||
|---|---|---|---|---|
| 1 |
|
Time studies in underground coal mining | 1964-06 | Text |
| 2 |
|
Study of various coal mines in Utah, Colorado, and Wyoming | 1950-05 | Text |