Black Cañon, Colorado River, Looking Above from Camp 7 by Timothy O'Sullivan https://www.rawpixel.com/image/8965101/black-canon-colorado-river-looking-above-from-camp-timothy-osullivan Free Image from public domain license
Canon png sticker weapon illustration, transparent background. Free public domain CC0 image. https://www.rawpixel.com/image/6848612/png-sticker-public-domain Free PNG from public domain license
U.S. Marine Corps Lance Cpl. Evan Bultemeier, a machine gunner with Battalion Landing Team 3/1, 13th Marine Expeditionary… https://www.rawpixel.com/image/3317850/free-photo-image-13th-marine-expeditionary-unit-meu-1st-division Free Image from public domain license
Ancient Ruins in the Cañon de Chelle, N.M. In a niche 50 feet above present Cañon bed. by Timothy O'Sullivan https://www.rawpixel.com/image/8963944/photo-image-border-aesthetic-mountain Free Image from public domain license
Firing the Canon, plate twelve from The Military Exercises by Jacques Callot https://www.rawpixel.com/image/8986049/firing-the-canon-plate-twelve-from-the-military-exercises-jacques-callot Free Image from public domain license
Loading the Canon, plate eleven from The Military Exercises by Jacques Callot https://www.rawpixel.com/image/8995782/loading-the-canon-plate-eleven-from-the-military-exercises-jacques-callot Free Image from public domain license
Captain Coopers [sic] Battery - 1 Pennsylvania B. [sic] in front of P. by Mathew B Brady https://www.rawpixel.com/image/14321128/image-person-art-man Free Image from public domain license
CGA Cadets conduct Parents Weekend Regimental ReviewNEW LONDON, Conn. -- The U.S. Coast Guard Academy faculty, staff… https://www.rawpixel.com/image/5976907/photo-image-public-domain-people-sports Free Image from public domain license
CGA Cadets conduct Parents Weekend Regimental ReviewNEW LONDON, Conn. -- The U.S. Coast Guard Academy faculty, staff… https://www.rawpixel.com/image/5977205/photo-image-public-domain-people Free Image from public domain license
CGA Cadets conduct Parents Weekend Regimental ReviewNEW LONDON, Conn. -- The U.S. Coast Guard Academy faculty, staff… https://www.rawpixel.com/image/5977208/photo-image-public-domain-person Free Image from public domain license
Captain Coopers [sic] Battery - 1 Pennsylvania B. [sic] in front of P. by Mathew B Brady https://www.rawpixel.com/image/14321156/image-person-art-men Free Image from public domain license
Thirteen Inch Mortar, Arsenal Yard, Washington, D.C. by A J Russell https://www.rawpixel.com/image/14276517/thirteen-inch-mortar-arsenal-yard-washington-dc-russell Free Image from public domain license
Wiley & Halsted [Minature scene with canon and small house built on a rock] https://www.rawpixel.com/image/14291999/wiley-halsted-minature-scene-with-canon-and-small-house-built-rock Free Image from public domain license
G.B. Fosters Naval Brigade. Captain [illeg.] C.M. 13 [illeg.] by Mathew B Brady https://www.rawpixel.com/image/14321324/gb-fosters-naval-brigade-captain-illeg-cm-illeg-mathew-brady Free Image from public domain license