Schenkel, Rudolf and Lotte Schenkel-Hulliger
Delacour, Jean and Pierre Jabouille
Langdale-Brown, I., H. A. Osmaston and J. G. Wilson




Stresemann, Erwin (translated By Hans J. And Cathleen Epstein; Edited By G. William Cottrell; Foreword and Epilogue o American Ornithology By Ernst Mayr)














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