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• Red shadowsRobert E. Howard
• Bucolic BeatitudesMacGregor Jenkins
• Felicidade pela Agricultura (Vol. II)Antonio Feliciano de Castilho
• Botanical features of the Algerian SaharaWilliam Austin Cannon
• Tarzan and the lost empireEdgar Rice Burroughs
• The EngadineSpencer C. Musson
• The logic of modern physicsP. W. Bridgman
• The course of creationJohn Anderson
• Submerged forestsClement Reid
• The ethics of HerculesRobert Chenault Givler
• Einstein, the searcherAlexander Moszkowski
• Naturgeschichte einer Kerzeمايكل فاراداي
• Naturstudien im HauseKarl Kraepelin
• Journal of a tour in Marocco and the Great AtlasJoseph Dalton Hooker
• The atom and the Bohr theory of its structureHelge Holst
• The Republic of Costa RicaGustavo Niederlein
• A decade of negro extension work, 1914-1924O. B. Martin
• The fields of FranceA. Mary F. Robinson
• Hochtouren im tropischen AmerikaHans Meyer
• The highest aim of the physicistHenry Augustus Rowland
• DarwinGamaliel Bradford
• Tarzan at the Earth's coreEdgar Rice Burroughs
• The shadow kingdomRobert E. Howard
• The mirrors of Tuzun ThuneRobert E. Howard
• Cape CodRobert Finch
• Catalogue of the dipterous insects collected at Singapore and MalaccaAlfred Russel Wallace
• Lions 'n' tigers 'n' everythingCourtney Ryley Cooper
• Landesverein Sächsischer Heimatschutz — Mitteilungen Band XII, Heft 10-12Landesverein Sächsischer Heimatschutz
• DaedalusJ. B. S. Haldane
• The agricultural and forest products of British West AfricaGerald C. Dudgeon
• The Ohio naturalist, Vol. 1, No. 3, January, 1901Ohio State University. Biological Club
• The human speciesA. de Quatrefages
• The public and its problemsJohn Dewey
• VenezuelaLeonard V. Dalton
• The illustrated story of evolutionMarshall J. Gauvin
• Political and commercial geology and the world's mineral resourcesJosiah Edward Spurr
• The chemical nature of the alpha particles from radioactive substancesErnest Rutherford
• The book of antelopes, vol. 1 (of 4)Philip Lutley Sclater
• Animal portraitureRichard Lydekker
• The book of antelopes, vol. 2 (of 4)Philip Lutley Sclater
• The book of antelopes, vol. 3 (of 4)Philip Lutley Sclater
• The celestial worlds discover'dChristiaan Huygens
• The manufacture of earth coloursJosef Bersch
• Desert and water gardens of the Red SeaCyril Crossland
• Ukraine, the land and its peopleStepan Rudnytskyi
• Skull-faceRobert E. Howard
• The Gnome King of OzRuth Plumly Thompson
• The book of antelopes, vol. 4 (of 4)Philip Lutley Sclater
• MazedonienFranz Doflein
• A mechanical and critical enquiry into the nature of hermaphroditesJames Parsons
• Out of RussiaCrittenden Marriott
• Nature's carol singersRichard Kearton
• Common names of a selected list of plantsKling L. Anderson
• On horse-breakingRobert Moreton
• A narrative of travels on the Amazon and Rio Negro,Alfred Russel Wallace
• Great Smoky Mountains National ParkUnited States. National Park Service
• Reis door Noord AmerikaPehr Kalm
• Guide to the study of animal ecologyCharles C. Adams
• Nature readersJulia McNair Wright
• The Ohio Naturalist, Vol. 1, No. 5, March, 1901Ohio State University. Biological Club