The birds of New Guinea and the adjacent Papuan islands, including many new species recently discovered in Australia: Part III
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- Regent Whistler plate 22
- Plate depicting: Pachycephala schlegelii (Schlegel, 1871) -- Regent Whistler. Alternate name, as printed: Pachycephala schlegeli -- Schlegel's thickhead
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- Australian Golden Whistler plate 23
- Plate depicting: Pachycephala pectoralis (Latham, 1802) -- Australian Golden Whistler. Alternate name, as printed: Pachycephala christophori -- San-christoval thickhead