A Check List of North American Amphibians and ReptilesKarl P. Schmidt · First published 1953Open the Tome
principles of animal ecologyw. c. allee, orlando park, alfred e. emerson, thomas park, karl p. schmidt · First published 1949Open the Tome
Magnetismus Elektromagnetisches FeldE. Alberti, G. Angenheister, E. Gumlich, P. Hertz, W. Romanoff, R. Schmidt, W. Steinhaus, S. Valentiner, W. Westphal, H. Geiger, Karl Scheel · First published 1927Open the Tome
