Untersuchung über die arbeitsergiebigkeit im ruhrkohlenbergbau in der kriegs- und nachkriegszeit .
By: von ... Bernhard Mertens ...
Publisher: Schulte
Published: 1925
Place of publication: Elberfeld
Language: ger
Number of pages: 45
Subjects: Coal mines and mining; Industrial efficiency
Notes: Thesis, Giessen, 1922.

Bibliography: p. 42-44.

Microfilm. New York, N.Y., Columbia University Libraries, 1999. 1 microfilm reel, 35 mm.

Filmed; NEH Project (FMEST); 1999.