Proceedings of the [twelfth] International Ornithological Congress: Helsinki, 5-12 June 1958.
![Stock ID 5363 Proceedings of the [twelfth] International Ornithological Congress: Helsinki, 5-12 June 1958. G. Bergman.](https://www.andrewisles.com/pictures/medium/5363.jpg?v=1609371948)
Helsinki: Publisher unknown, 1960. Large octavo, text illustrations, publisher's wrappers, a very good set.
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