Frankfurt a.M., 1890. 4to. No wrappers. In: ""Abhandlungen hrsg. von der Senckenbergischen Naturforschenden Gesellschaft."" (80) pp., 1 lithographed plate.
First edition.
Halle, 1896. 4to. Uncut without wrappers. ""Nova Acta Leopoldina"" Bd. 69. Nr. 1. Pp. 1-251,(2) pp. and 12 plates (5 in collotype and 7 double-page lithographed colourplates). Clean and fine.
Gotha, Julius Perthes, 1887. 4to. No wrappers. (2),37 pp., 3 maps (on 2).
(Petermann's ""Geographischen Mittheilungen"", Ergänzungsheft No 87).