Document 820
Heirman, J. 1975. A Belgian Birdstrike Risk Map based on numbers of birds to the unit of area. Proceedings of the Bird Strike Committee Europe. BSCE10-WP11. Stockholm, Sweden. 6 pages.
Heirman, J. 1975. A Belgian Birdstrike Risk Map based on numbers of birds to the unit of area. Proceedings of the Bird Strike Committee Europe. BSCE10-WP11. Stockholm, Sweden. 6 pages.
