World War I, boxed set of Keystone Stereoscopic views by [WWI; Stereoscopic views] - 1916

Meadville, Pa: Keystone View Company, 1916. Very good condition. A set of 50 cards, consecutively numbered at the top of each card and text on the verso; with the original box. The cards in excellent condition, with card number 19 "Zeppelin Wrecked and Burned -- Ruins Being Inspected by French Troops"; also card number 22, "Observation Balloon Fatally Pierced by Incendiary Bullets from American Plane". The cards in very good condition; the box with short split at one seam.