unclear relation to organ builder Carl Friedrich Geyer (1807-1865) ; not to be confused w. Charles Andreas Geyer (1809–1853), botanist & pl
since age 15 apprent. to copper engr. & lepidopterologist Jacob Hübner (1761-1826): http://viaf.org/viaf/50019978
Germany
Cajetan Freiherr von Felder (1814-1894) ; Gottlieb August Wilhelm Herrich-Schäfer (1799-1874) ; Jacob Hübner (1761-1826)'s works on Lepidoptera ; Julius Lederer (1821-1870) ;
illustr. the lepidopterological findings of the Austrian Novara-Expedition (1857-1859), Zoolog. Theil, publ. 1864-75
zoological and entomological drawing and engraving ; hand-colouring