TY - BOOK ID - 134938395 TI - On the feeding ecology of the herring gull Larus Argentatus Pont. in the northern part of the Netherlands PY - 1971 PB - S.l. Nederlandse Ornithologische Unie DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:134938395 AB - ER -