Beitrag zur Theorie der Schachtlotung.

Husmann, Alfred.

Universitatsverlag von Robert Noske, Borna-Leipzig, 1932

Paperback. viii,28 pp., fig./ill., & 66 tabels, some folding; 21x15 cm. Thesis 'Technischen Hochschule Aachen' Text in German / Deutsch. (covers bit worn, ticket on cover, few stamps, slightly browned) Although very good, see picture