A nomenclature of colors for naturalists : and compendium of useful knowledge for ornithologists (1886)
Ridgway, Robert, 1850-1929, Wetmore, Alexander, 1886-1978 former owner. DSI, John Wilson and Son, printer · Boston : Little, Brown and Company · leaf 170
4. Berlin Blue. 5. Hyacinth Blue. 6.French Blue.
Birds · Ornithology · Color
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
