Leipzig, Alfred Langkammer, 1892. vii, 232 pp. 8vo (16 x 24,5 cm.). Contemporary half leather (rubbed; top of spine damaged). With 1 folded table and one double-page coloured map (lithograph).
One of the first studies of its kind. With the stamp on title of the former "Prov. Taubstummen - Anstalt zu Halle".