Cpe artillery pulling 01.jpg
Originally scanned from: GWS - The Great War: The Standard History of the All Europe Conflict (volume four) edited by H. W. Wilson and J. A. Hammerton (Amalgamated Press, London 1915)

According to http://www.firstworldwar.com/photos/sources.htm, “Each photo is believed to be copyright-expired except where indicated.” The site has been up for seven years and sources for the photos cited so it is reasonable this claim of copyright expired status has stood the test of time.

Note: other than the source of the image and the assertion of copyright free status, detail information such as credits for each photographer and image provider was not indicated for each image.
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Cpe artillery pulling 01, Cannone da 149/23, Cannone da 149/23
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Cpe artillery pulling 01, Cannone da 149/23
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牽引する周防備砲 01、カンノーネ da 149/23、カンノーネ da 149/23
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牽引する周防の砲兵
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pull-up asserted