A DIAGRAM OF SECTIONAL AREAS OF RAILROAD EARTHWORK.
| Autor: | WELLINGTON, ARTHUR M. |
|---|---|
| Zdroj: | Railroad Gazette; 07/22/1871, p189-189, 7/9p, 1 Diagram, 1 Graph |
| Databáze: | Supplemental Index |
| Externí odkaz: |
|
| Autor: | WELLINGTON, ARTHUR M. |
|---|---|
| Zdroj: | Railroad Gazette; 07/22/1871, p189-189, 7/9p, 1 Diagram, 1 Graph |
| Databáze: | Supplemental Index |
| Externí odkaz: |
|