This is a derivative work based on <a href="//commons.wikimedia.org/wiki/File:P-47_gun_harmonization_1945_page_34.jpg" title="File:P-47 gun harmonization 1945 page 34.jpg">File:P-47 gun harmonization 1945 page 34.jpg</a> and <a href="//commons.wikimedia.org/wiki/File:P-47_gun_harmonization_1945_page_35.jpg" title="File:P-47 gun harmonization 1945 page 35.jpg">File:P-47 gun harmonization 1945 page 35.jpg</a>. Parts of the two pages of the USAAF manual have been combined to show two gun harmonization schemes more clearly in one image.
United States Army Air Forces (originals), Binksternet (derivative work)
<a href="//commons.wikimedia.org/wiki/File:P-47_gun_harmonization_1945_page_34.jpg" title="File:P-47 gun harmonization 1945 page 34.jpg">File:P-47 gun harmonization 1945 page 34.jpg</a> and <a href="//commons.wikimedia.org/wiki/File:P-47_gun_harmonization_1945_page_35.jpg" title="File:P-47 gun harmonization 1945 page 35.jpg">File:P-47 gun harmonization 1945 page 35.jpg</a>