File:America's Highways 1776–1976 - page 497b.jpg
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Summary
| Description |
English: The slope was drilled and small charges of dynamite were set to blast the face of the slope for what is called presplitting of cut slopes. The drills and other equipment had to be high-lined on cables to the top of the slope. |
| Date | |
| Source | https://en.wikisource.org/wiki/Page:America%27s_Highways_1776%E2%80%931976.djvu/503 |
| Author | Federal Highway Administration |
Licensing
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This image is a work of a United States Department of Transportation employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain. | 
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:32, 7 February 2023 | | 2,187 × 783 (1.44 MB) | Sp1nd01 | Uploaded a work by Federal Highway Administration from https://en.wikisource.org/wiki/Page:America%27s_Highways_1776%E2%80%931976.djvu/503 with UploadWizard |
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