Carl Fischer printer's mark (circa 1912)
Original: Carl Fischer; SVG: <a href="//commons.wikimedia.org/wiki/User:DraftSaturn15" title="User:DraftSaturn15">DraftSaturn15</a>
Own work based on the logo on the title page of <a href="//commons.wikimedia.org/wiki/File:Essentials_of_music_theory_(1912).djvu" class="image"><img alt="Essentials of music theory (1912).djvu" src="https://upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Essentials_of_music_theory_%281912%29.djvu/page1-100px-Essentials_of_music_theory_%281912%29.djvu.jpg" decoding="async" width="100" height="150" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Essentials_of_music_theory_%281912%29.djvu/page1-150px-Essentials_of_music_theory_%281912%29.djvu.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Essentials_of_music_theory_%281912%29.djvu/page1-200px-Essentials_of_music_theory_%281912%29.djvu.jpg 2x" data-file-width="2371" data-file-height="3567"></a>