| Avaa | Persat, H.
| Photographic identification of individual grayling, Thymallus thymallus, based on the disposition of black dots and scales | | artikkeli | harjus - harri | | | 1982 | 5+12 valokuvaa | | | Eripainos: Freshwater Biology ... | I-Kalatutkimus: Harjus (avokotelo 3) |