found: Ackermann and Compy.'s catalogue of prints ... 1850?:t.p. (Ackermann and Compy.) p. 1 (Ackermann)
found: NUC Pre-1956 impr.(Ackermann, firm, publishers, London); usage: Ackermann & Co., Ackermann)
found: P.O. London dir., 1847-51(Ackermann & Co.)
found: A new matrimonial ladder, between 1820 and 1842?:t.p. (Ackermann & Co.)
found: Exeter Working Papers in British Book Trade History WWW homepage, Jan. 24, 2003:working paper 0, The London book trades 1775-1800 : a preliminary checklist of members (Ackermann, Rudolph, printseller and publisher; trading as: Rudolph Ackermann, 1795-1829; Ackermann and Co., 1829-1859)
found: Reconocimiento del istmo de Tehuantepec, 1844:title page (Londres : En casa de Ackermann y Compa.)
