Document 860
Hild, J. 1978. Birdstrikes on Helicopters in German Air Force. Proceedings of the Bird Strike Committee Europe. BSCE13-WP4. Bern, Switzerland. 7 pages.
Hild, J. 1978. Birdstrikes on Helicopters in German Air Force. Proceedings of the Bird Strike Committee Europe. BSCE13-WP4. Bern, Switzerland. 7 pages.
