WOLFF WJ (1963) Short announcements: Report of a flight above the Province of Southern-Holland during the severe last winter. LIMOSA 36 (3): 184-185.

On January 25th, 1963 the author flew above the delta-area of the Province of Southern-Holland. A list is given of the total number of specimens of Wildfowl seen during this trip. For the route see the line (- - - - -) on the map.

[free pdf] [dutch summary]