Document 823
Helkamo, H. and O. Stenman. 1984. Progress in Bird Control at Helsinki-Vantaa Airport. Proceedings of the International Bird Strike Committee, Rome, Italy IBSC17/WP33:371-373.
Helkamo, H. and O. Stenman. 1984. Progress in Bird Control at Helsinki-Vantaa Airport. Proceedings of the International Bird Strike Committee, Rome, Italy IBSC17/WP33:371-373.
