The complete set of four volumes bound in green buckram with reinforced hinges. Bulletin LXV (1932), LXXV (1939), 75A (1953) and 75B (1954). Published in 4 parts over a period of 21 years. Chapin went to the Belgian Congo (today Zaire) in 1909 at the age of 18 where he remained until the outbreak of WWI. On his return to New York, he resumed his studies and then produced the present work, 'one of the most thoroughly prepared and notable faunal works in the literature of ornithology and an indispensable work on African birds.' Mengel