Panama, 1958 : to visit the Canal Zone Biological Area and to collect bird specimens in the Canal Zone, Bocas del Toro, Cocle, La Jagua, and on Isla Escudo de Veraguas; Assisted by Beatrice Thielen Wetmore; Correspondence, reference materials, expense records, travel notes, photographs and photographic records, field report, and memorabilia. Correspondents include Herbert Friedmann and Louise M. Pearson
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