He began the work in 1894 at the direction of Goode .
Robert Ridgway 's career - crowning work , on bird systematics , was the monumental 6,000 - page The Birds of North and Middle America , published by the Smithsonian in eleven volumes between 1901 and 1950 .
Robert Ridgway began the work in 1894 at the direction of Goode .
Robert Ridgway 's career - crowning work , on bird systematics , was the monumental 6,000 - page The Birds of North and Middle America , published by the Smithsonian in eleven volumes between 1901 and 1950 .