Tests of Strength of Roof Supports Used in Anthracite Mines of Pennsylvania (All Formats)
This item is available in multiple formats. Choose one below.
| Number of items: | 48 |
|---|---|
| Filetype: | tif (image) |
| Number of items: | 1 |
|---|---|
| Filetype: | pdf (file) |
This item is available in multiple formats. Choose one below.
| Number of items: | 48 |
|---|---|
| Filetype: | tif (image) |
| Number of items: | 1 |
|---|---|
| Filetype: | pdf (file) |