| Authors(s) | Ewins P.J. |
| Year | 1990 |
| Title | The diet of Black Guillemots Cepphus grylle in Shetland (Scotland, UK). Holarctic Ecology 13: 90-97 |
| Authors(s) | Ewins P.J. |
| Year | 1990 |
| Title | The diet of Black Guillemots Cepphus grylle in Shetland (Scotland, UK). Holarctic Ecology 13: 90-97 |