Proceedings of the International Ornithological Congress
Proc. Int. Ornithol. Congr.
International Ornithologists’ Union
Some vols. have title in French, German, Hungarian, or Latin.
The volumes in this series may also be classified as individual books, or as articles in other journals.
Links to some recent proceedings found here: http://int-ornith-union.org/?page_id=86
no. 1–5 (1894–1910)
Biodiversity Heritage Library