(1) Der Naturfreund am Strande der Adria und des Mittelmeergebietes (2) The Aims and Methods of Nature-Study

(1) Die Süsswasser-Flora Deutschlands, Osterreichs und der Schweiz (2) Die Süusswasserfauna Deutschlands eine Exkursions-fauna

(1) Elementary Aeronautical Science (2) Les Hélicoptères: Recherches expérimentales sur le fonctionnement le plus général des hélices: Études sur le miéanique de l'hélicoptère (3) Étude sur le ballon captif et les aéronefs matins (4) Sur la théorie des sur

(1) Éloges et discours académiques (2) Figures de Savants

(1) Essais de Synthèse Scientifique (2) Contre la Métaphysique (3) Modern Science and the Illusions of Prof Bergson (4) Wissenschaft und Wirklichkeit (5) The Young Nietzsche

(1) Everyday Life in the Old Stone Age (2) The World-Story of 3,000,000,000 (?) Years

(1) Everyday Marvels of Science: a Popular Account of the Scientific Inventions in Daily Use (2) This Scientific Age: Essays in Modern Thought and Achievement (3) Master Minds of Modern Science

(1) Everyman's Astronomy (2) Starcraft

(1) Evolution and Christian Faith (2) Origin and Evolution of Religion

(1) Evolution and the War (2) Societal Evolution: a Study of the Evolutionary Basis of the Science of Society (3) Symbiogenesis: The Universal Law of Progressive Evolution

(1) Ex-meridian, Altitude, Azimuth, and Star-finding Tables (2) Nautical Charts (3) A Text-book of Theodolite Surveying and Levelling

(1) Exploring about the North Pole of the Winds (2) La navigation aérienne transatlantique

(1) Faculté des Sciences de Paris: Cours d'astronomie (2) Trattato di astronomia siderale

(1) Faune de France (2) Faune de France

(1) Géographie universells (2) Tome 2: Belgique, Pays-Bas, Luxembourg

(1) Ghosts and Spirits in the Ancient World (2) Possession, Demoniacal and other: among Primitive Races, in Antiquity, the Middle Ages, and Modern Times (3) Animism, Magic and the Divine King

(1) Gnomonica: L'Orologio Solare a Tempo Vero nella sua Moderna Applicazione (2) Lezioni di Cosmografia

(1) Goethe's Philosophie aus seinen Werken (2) Immanuel Kant, Physische Geograhie (3) Dialoge über natürliche Religion, über Selbstmord und Unsterblichkeit der Seele (4) Immanuel Kant's Kleinere Schriften zur Logik und Metaphysik (5) G W F Hegel, Encyclopä

(1) Greek Astronomy (2) Early Astronomy and Cosmology: a Reconstruction of the Earliest Cosmic System

(1) Grundriss der Cytologie (2) Handbuch der Pflanzenanatomie