Grinbergs,A. R. (1963) Nekotorye dannye o faune peroedov ptic semejstv Accipitridae v Latvii
Skutch, A. F. (1947) The Castlebuilder
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(2016). GBIF Backbone Taxonomy. GBIF Secretariat. Checklist Dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2017-05-26.
This backbone name usage is included because it was found in another checklist at the time the backbone was built. The primary source name usage (123611404) has since been removed from the portal.
This record was last modified on Feb 14, 2017.