Document 1585
Suter, W. 1978. Roosting and Feeding Flights of Black-Headed Gulls (Laridus ridibundus) in the Region of Zurich Airport. Proceedings of the Bird Strike Committee Europe. BSCE13-WP19. Bern, Switzerland. 6 pages.
Suter, W. 1978. Roosting and Feeding Flights of Black-Headed Gulls (Laridus ridibundus) in the Region of Zurich Airport. Proceedings of the Bird Strike Committee Europe. BSCE13-WP19. Bern, Switzerland. 6 pages.
