Birds of Europe in five volumes, published between 1832 and 1837, while in the interim (1834) appeared A Monograph of the Ramphastidae, of which a second edition was some years later called for, then the Icones avium, of which only two parts were published (1837-1838), and A Monograph of the Trogonidae (1838), which also reached a second edition.
Cassin's "Study of the Ramphastidae," in the Proceedings of the Philadelphia Academy for 1867 (pp. 100-124).
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