lithographer Friedrich Specht (brother) ; animal illustrator August Specht (1849-1923) (brother)
Carl Gustav Otto Christian Wrangel (1839-1908)
Germany
Friedrich Specht (1939-1909) ; Franz Straessle (1xxx-1xxx): Handbuch der Naturgeschichte aller drei Reiche (Stuttgart 1857-60) ; Carl Christoph Vogt (1817-1895) ; Carl Gustav Otto Christian Wrangel (1839-1908) ; Alfred Edmund Brehm: Tierleben (1864-69) ; Richard Lydekker: Royal Nat Hist (1894-6) ;
lithographer and artist Friedrich Specht (brother) ;
ornithological, natural, and zoological woodcutting /wood engraving, and drawing