Difficulties in the ageing of the Herring Gull and Lesser Black-backed Gull

• Published in: Bird Study
• Main Author: Harris, M. P.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Informa UK Limited 1962
• Subjects: Nature and Landscape Conservation; Ecology, Evolution, Behavior and Systematics; Lesser black-backed gull
• Online Access: http://dx.doi.org/10.1080/00063656209476017; http://www.tandfonline.com/doi/pdf/10.1080/00063656209476017