Document 787
Hamershock, D. M. 1992. Ultrasonics as a method of bird control. Proceedings of the International Bird Strike Committee, Jerusalem, Israel IBSC21/WP39:359-389.
Hamershock, D. M. 1992. Ultrasonics as a method of bird control. Proceedings of the International Bird Strike Committee, Jerusalem, Israel IBSC21/WP39:359-389.
