February 1956 – vol. 49, issue 2–88 S I R S , -- A census of breeding Great Black-backed Gulls (Larus marinns) in England and W a l e s in 1956 has been approved as an investigation of the British Trust for Ornithology. As organise* I shall be glad of offers of help from those who are willing to undertake the field work in their own areas, or other localities familiar to them. Negative reports from parts of the coast where it is kno... This article is only available to registered users.To read more, please log in or purchase a subscription.