Acta [Twentieth] Congressus Internationalis Ornithologici: Christchurch, New Zealand, 2-9 December 1990.
![Acta [Twentieth] Congressus Internationalis Ornithologici: Christchurch, New Zealand, 2-9 December 1990. Ben Bell.](https://www.andrewisles.com/pictures/medium/12193.jpg?v=1550824232)
Wellington: Ornithological Congress Trust Board, 1990-1991. Octavo, softcover.
.
Wellington: Ornithological Congress Trust Board, 1990-1991. Octavo, softcover.
.