The Impact of the Mersey oil spill of August 1989 on the populations and distributions of waterfowl : a report by the British Trust for Ornithology to Mersey Oil Spill Project Advisory Group in fulfilment of Contract 3A /
Clark, N. A.
British Trust for Ornithology.
Tring : British Trust for Ornithology,
1992.
"August 1990".