Friedrich Wilhelm Heinrich Alexander von Humboldt – niemiecki przyrodnik i podróżnik, jeden z twórców nowoczesnej geografii, młodszy brat Wilhelma von Humboldta. Laureat Medalu Copleya.
Friedrich Wilhelm Heinrich Alexander von Humboldt, född 14 september 1769 i Berlin, död 6 maj 1859 i Berlin, var en tysk friherre, geograf, naturforskare och upptäcktsresande. Han var yngre bror till Wilhelm von Humboldt.
Friedrich Wilhelm Heinrich Alexander von Humboldt, o barão de Humboldt, mais conhecido como Alexander von Humboldt, foi um geógrafo, polímata, naturalista, explorador e proponente da filosofia romântica prussiano.
Alexander Wilhelm Andreas Freiherr von Kaulbars was a Baltic German military leader who served in the Imperial Russian Army during the late 19th and early 20th centuries. A noted explorer of Central Asia, he was also regarded as one of the original organisers of the Russian Air Force.
Alexander Theodor von Middendorff was a zoologist and explorer of Baltic German and Estonian extraction. He is known for his expedition 1843–45 to the extreme north and east of Siberia, describing the effects of permafrost on the spread of animals and plants.
Alexander Theodor von Middendorff, est un zoologiste et un explorateur allemand de la Baltique, sujet de l'Empire russe, né le 18 août 1815 à Saint-Pétersbourg et mort le 24 janvier 1894 dans son manoir d'Hellenorm (en) dans le district de Walk en Livonie.
