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Cover of the May 1947 publication of "Our Yard" magazine for the employees of Sun
Shipyard in Chester, Pennsylvania (an "in-house" magazine published without copyright). Photo by Al Knott, a shipyard employee, shows the hammer-head crane. See page 15 for a description at
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Pre-1978 without copyright notice US public domain images
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in the United States between 1929 and 1977 inclusive,
208://en.wikipedia.org/File:Our_Yard_May_1947_cover.jpg
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http://sunshiporg.homestead.com/ouryard/oy_4705.pdf
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http://sunshiporg.homestead.com/ouryard/oy_4705.pdf
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