Aerial survey of harbour (Phoca vitulina) and grey seals (Halichoerus grypus) in Scotland in 2016 : Orkney and the north coast, the Moray Firth and part of east Scotland /
Duck, Callan,author.
Morris, C.(Chris),author.
Scottish Natural Heritage (Agency)
Includes bibliographical references (page 5).
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Description from online resource; title from PDF title page (Scottish Natural Heritage, viewed 5 February, 2020)
Harbor seal
Gray seal
Aerial surveys