Three Moored Sailing Vessels, from Thirteen Naval Scenes by Reinier Zeeman, (Reinier Nooms) https://www.rawpixel.com/image/8971279/image-paper-sky-artFree Image from public domain licenseFour Sailing Vessels in a Breakwater, from Thirteen Naval Scenes by Reinier Zeeman, (Reinier Nooms) https://www.rawpixel.com/image/8979239/image-paper-person-artFree Image from public domain licenseDock Scene (recto); Two Sketches of Male Figures (verso) by Guillaume Courtois https://www.rawpixel.com/image/8998116/dock-scene-recto-two-sketches-male-figures-verso-guillaume-courtoisFree Image from public domain license