✦ LIBER ✦
Photographing shaft interiors by reflected sunlight : W. W. Fleming, of the U. S. Geological Survey, describes in Mining and Metallurgy, Vol. 17, No. 350
✍ Scribed by R.H.O.
- Publisher
- Elsevier Science
- Year
- 1936
- Tongue
- English
- Weight
- 62 KB
- Volume
- 221
- Category
- Article
- ISSN
- 0016-0032
No coin nor oath required. For personal study only.