1931 2 volumes (complete). vii, 160 p., 5 figs, 150 distribution maps, small folio, paperbound (text) and hcloth covers (spine partly loose and taped, front cover loose). Library stamps.
Berlin, Friedländer & Sohn, 1931. 4to. Orig. portfoliomappe. VII,160 pp. and 148 (of 150, lacks no. 49-50) plates (migration-maps). (Abhandl. aus d. Gebiete der Vogelzugsforschung Nr. 3, Hrsg. v. d. Vogelwarte d. Staatl. Biol. Anstalt auf Helgoland). Bookplate of Lorenz Ferdinand.