A review of larger Philippine swiftlets of the genus CollocaliaPublished in Forktail, in 1989, in volume 4, pages 19-53A review of smaller Philippine swiftlets of the genus CollocaliaPublished in Forktail, in 1989, in volume 5, pages 23-34
A review of smaller Philippine swiftlets of the genus CollocaliaPublished in Forktail, in 1989, in volume 5, pages 23-34