Der Äther und die Relativitätstheorie. Sechs Vorträge. Mit 19 Abbildungen.

Graetz, Leo.

J. Engelhorns Nachf., Stuttgart, 1923

23.5 x 16 cm, softcover, viii, 80 pages, Text in German, covers worn, discoloured and partly loose, paper browned, name, stamp, although still in acceptable condition, see picture.