Birds of North and Middle America, descriptive catalog of higher groups, genera, species, and subspecies of birds known to occur in North America, from Arctic lands to Isthmus of Panama, West Indies and other islands of Caribbean Sea, and Galapagos Archipelago; pt. 9, Family Gruidae-cranes, family Rallidaerails, coots, and gallinules, family Heliornithidae-sun-grebes; family Eurypygidae-sun-bitterns, by Robert Ridgway; continued by Herbert Friedmann.

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