Date: | 1945 |
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Description: | A group of men laying rails at Hawkins Mine while a man in the background is using surveying equipment near the base of a cliff face. |
Date: | 03 09 1955 |
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Description: | A man wearing a hat looks through the eye piece of his surveying instrument, called a 'theodolite,' which rests on a tripod. |
Date: | 1886 |
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Description: | Front cover featuring illustrations of wheeled scrapers, drag scrapers, railroad plows and road graders. |
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