@misc{Hewer_H._R._Field_1959,
 author={Hewer, H. R. and Backhouse, K. M.},
 volume={132},
 number={1},
 copyright={Rights Reserved - Restricted Access},
 address={Londyn},
 journal={Proceedings of the Zoological Society of London},
 howpublished={online},
 year={1959},
 publisher={Wiley-Blackwell},
 language={eng},
 title={Field identification of bulls and cows of the grey seal, Halichoerus grypus Fab},
 type={Text},
 keywords={Halichoerus grypus, Field identification, Seal},
}