This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Map of Helgoland in . Navy map of the German island of Helgoland engl Heligoland in Official Navy photo history navy mil from the Navy history navy mil Naval History and Heritage Command Navy Headquarters London Intelligence Section PDUSGovMilitaryNavy Maps of Heligoland
Page 2023 Free-images.com. All images are Public Domain