File:America's Highways 1776–1976 - page 327b.jpg

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English: Research engineer scans slice of concrete with microscope to determine size and distribution of air voids, important in the durability of concrete, especially under the action of freezing temperatures.
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Source https://en.wikisource.org/wiki/Page:America%27s_Highways_1776%E2%80%931976.djvu/333
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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current21:20, 4 January 2023Thumbnail for version as of 21:20, 4 January 20231,038 × 977 (566 KB)Sp1nd01 (talk | contribs)Uploaded a work by Federal Highway Administration from https://en.wikisource.org/wiki/Page:America%27s_Highways_1776%E2%80%931976.djvu/333 with UploadWizard

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