Tests of strength of roof supports used in anthracite mines of Pennsylvania [microform]
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| Other Authors: | |
|---|---|
| Format: | Government Document Microfilm Book |
| Language: | English |
| Published: |
[Washington?] :
U.S. G.P.O.,
1929.
|
| Series: | Bulletin (United States. Bureau of Mines) ;
303. |
| Subjects: |
Norlin Library - Government Information - Microform
| Call Number: |
EBD C22.3-303
|
|---|---|
| EBD C22.3-303 | Restricted Place a Hold |