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Keywords from Image Description:
CBBM . Percnostola fortis Scl et Salv Sclater Salvin en fortis head and foot from lateral underwing showing length of remiges Catalogue of the birds in the British Museum archive org Vol Page Philip Lutley Sclater text PDold CBBM Myrmeciza fortis Thamnophilidae feet Thamnophilidae heads Thamnophilidae wings