Natürliches System der Amphibien : mit vorangehender Classification der Säugethiere und Vögel : ein Beitrag zur vergleichenden Zoologie Q Science
Lectures introductory to the theory of functions of two complex variables; delivered to the University of Calcutta during January and February 1913 Q Science
Artrópodos del viaje al Pacífico verificado de 1862 á 1865 por una comision de naturalistas enviada por el gobierno español. Insectos neurópteros y ortópteros Q Science
A manual of the vertebrate animals of the northern United States : including the district north and east of the Ozark Mountains, south of the Laurentian Hills, north of the southern boundary of Virginia, and east of the Missouri River, inclusive of marine species Q Science
Is Mars habitable? A critical examination of Professor Percival Lowell’s book “Mars and its canals,” with an alternative explanation Q Science
