New York: Grosset & Dunlap, 1919. 8vo, mustard cloth pictorially stamped in red & black, d.w. New York: Grosset & Dunlap, (1919). Early edition, this title being the last listed at the front of the book, although the verso of the dust wrapper lists "His Sky Train". Penciled gift inscription, 1934. Fine copy in a bright dust wrapper, with minimal edge-wear & a closed tear.
New York: McBride, 1917. 36 full page plates, 87 sketches and diagrams. 144pp., 8vo, green cloth; covers rubbed with a few minor dents, remainder of library sticker pasted to inside front cover, LACKS FRONTIS ILLUSTRATION, small puncture in lower quarter of page running from beginning to about page 110, does not affect readability New York: Robert McBride, 1917. A few things going on, but overall a very good copy.