OBERTH, HERMANN. Die Rakete zu den Planetenräumen. 2 folding plates; 58 text illustrations. 92 pages, with advertising slip tipped in. 8vo, 254x176 mm, original gray wrappers, fragile, worn along edges, spine chipped in a few places; contents clean; cloth-backed board folder. Contemporary signature of the Austrian physicist Rudolf Pozdena on title, his scattered underscoring and marginalia in text, and tipped-in invoice from the publisher. Munich: R. Oldenbourg, 1923