Document 894
Houghton, E.W.; F. Blackwell, M. Ogilvie and T.A. Wilmot. 1975. A Radar Study of Wild Duck. Proceedings of the Bird Strike Committee Europe. BSCE10-WP40. Stockholm, Sweden. (pages 10 and 17 only).
Houghton, E.W.; F. Blackwell, M. Ogilvie and T.A. Wilmot. 1975. A Radar Study of Wild Duck. Proceedings of the Bird Strike Committee Europe. BSCE10-WP40. Stockholm, Sweden. (pages 10 and 17 only).
