American mine accounting methods and forms employed by leading mining companies
| Prif Awdur: | |
|---|---|
| Fformat: | Llyfr | 
| Iaith: | English | 
| Cyhoeddwyd: | New York
          McGraw-Hill
    
        c1912. | 
| Cyfres: | Mining library, v. 7 | 
| Pynciau: | 
| Prif Awdur: | |
|---|---|
| Fformat: | Llyfr | 
| Iaith: | English | 
| Cyhoeddwyd: | New York
          McGraw-Hill
    
        c1912. | 
| Cyfres: | Mining library, v. 7 | 
| Pynciau: |