Found in 8 Collections and/or Records:
Two birds facing each other in trees, black and white markings. Great Pied Hornbill - India - Watercolor for Elliot, D.G."A Monograph of the Bucerofidae or Family Hornbills" Privately published, 18 c. plate 6. Inscription: MC "1/3" on reverse "Hornbills - Gt. Pied/ Early draft of plate 6?/ Dichornos, bicornus/ bicornis."
Three birds: one male, two females - one female in nest in hollow tree, two other birds on branches. Inscription: LM "2/5" on reverse "Hornbills Plate 7/Rufous Hornbill - Philip/ hydrororax."
Three birds sitting on branches, sex? - blue-black bodies with white and black tails in jungle. Inscription: On reverse "Hornbills/ Early draft of Plate 4?/ Rhinoceros Hornbill."
Silvery-cheeked Hornbill. Two birds: male and female, sitting on a branch facing left. Inscription: MC "2/5" on reverse "Hornbills 7 Bycanistes breuis = cristatus/ Africa/Early draft of plate 26."
Two birds: male and female facing each other, sitting on branches in the jungle. Inscription: MC "2/5" on reverse "8/ Obsurus (plicatus)/ - Ryticeros undulatus - Indian/Early draft of plate 35 - Hornbills."