File:America's Highways 1776–1976 - page 324b.png

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English: Taking soil samples for field subgrade soil studies.
Date
Source https://en.wikisource.org/wiki/Page:America%27s_Highways_1776%E2%80%931976.djvu/330
Author Federal Highway Administration

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Public domain 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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current18:44, 3 January 2023Thumbnail for version as of 18:44, 3 January 20231,043 × 683 (1.24 MB)Sp1nd01Uploaded a work by Federal Highway Administration from https://en.wikisource.org/wiki/Page:America%27s_Highways_1776%E2%80%931976.djvu/330 with UploadWizard

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