Italian auto-cannons in action.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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Italian auto cannons in action, World War I self-propelled anti-aircraft artillery, Self-propelled artillery of Italy, Cannone da 102/35, SPA vehicles
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Italian auto cannons in action, Italian auto-cannons in action., Italian auto-cannons in action.
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イタリアの自動機関砲、第一次世界大戦の自走対空砲、イタリアの自走砲、ダ・102/35、特殊作戦軍の車両
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イタリアの自動機関砲、イタリアの自動機関砲、イタリアの自動機関砲
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old italian self-assertion self-propelled artillery propel italian self-propelled asserted