Volumes 1-19, 1990-2008. Two numbers annually for the first 10 volumes, thereafter four numbers per volume. A premier journal for scientific research on birds and their habitats in the Neotropical Region. Peer-reviewed papers are published in Spanish, Portuguese, and English. Includes the Volume 19 Supplement: Proceedings of the VIIIth Neotropical Ornithological Congress edited by Robert McNeil. 657 pp. Lacking only Volume 13, No. 3.