A monograph of the Bucerotid, or family of the hornbills..[London]Published for the subscribers by the author [printed by Taylor and Francis]1882..biodiversitylibrary.org/page/38534521
A natural history of the birds of New South Wales collected, engraved, and faithfully painted after nature /.London :Printed for J.H. Bohte,1822..biodiversitylibrary.org/page/57359624
The birds of Norfolk & Lord Howe Islands and the Australasian South Polar quadrant :London :H.F. & G. Witherby,1928.biodiversitylibrary.org/page/58795189
The birds of North AmericaNew York :Published under the auspices of the Natural Science Association of America,1903. biodiversitylibrary.org/page/35159679Aquila chrysaetos use 9 different calls 2 communicate esp. when their young & food are involved! biodiversitylibrary.org/page/35159679 #bhlpod > thx @eol