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The otter. (1984)
The water vole and mink survey of Britain 1996-1998, with a history of the long term changes in the status of both species and their causes. (2003)
The water vole Arvicola terrestris in Britain 1989-1990: its distribution and status (1993)
Otters on the Somerset Levels and moors 1983-84: summary of report ([1985])