English: Artillery map for the Lens area, 11 May 1917. The German trenches, indicated in red, would have been targets in preparation for the battle at Hill 70 in August 1917.
Canada. Dept. of National Defence, 1st Field Survey Company, Royal Engineers
Licensing
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This Canadian work is in the public domain in Canada because its copyright has expired due to one of the following:
1. it was subject to Crown copyright and was first published more than 50 years ago, or
it was not subject to Crown copyright, and
2. it is a photograph that was created prior to January 1, 1949, or
3. the creator died prior to January 1, 1972.
You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
Note that this work might not be in the public domain in countries that do not apply the rule of the shorter term and have copyright terms longer than life of the author plus 50 years. In particular, Mexico is 100 years, Jamaica is 95 years, Colombia is 80 years, Guatemala and Samoa are 75 years, Switzerland and the United States are 70 years, and Venezuela is 60 years.
This work is an Ordnance Survey map over 50 years old, which is covered by Crown Copyright which in this case expires 50 years after publication. Ordnance Survey does however ask that they be credited and that the date of publication be given.
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{{Information |Description={{en|1=Artillery map for the Lens area, 11 May 1917. The German trenches, indicated in red, would have been targets in preparation for the battle at Hill 70 in August 1917.}} |Source=Canadian War Museum (George Metcalf Archival