1. Why do seabird number vary?;Bourne;New Scientist,1972
2. Polychlorinated biphenyls in North Atlantic seabirds;Bourne;Mar. Pollut. Bull.,1972
3. Seabirds and Pollution;Bourne,1976
4. No refuge in the Zoo;Clark;Mar. Pollut. Bull.,1978
5. Wielki Atlas Ptaków;Hanzák,1974