Slud, Paul The birds of Hacienda Palo Verde, Guanacaste, Costa Rica / Paul Slud - Washington : Smithsonian Institution Press, 1980 - 92p. : ill. ; 28cm. - Smithsonian contributions to zoology ; no. 292 . Bibliography: p. 60-61. LCCN: 78-027666 Subjects--Topical Terms: Birds--Costa Rica--Palo Verde