OUWENEEL GL (1992) Boekbespreking: Brown, R. ... (et al.), Tracks & signs of the birds of Britain and Europe. An identification guide, 1992. LIMOSA 65 (4): 178-178.

BROWN R., FERGUSON J., LAWRENCE M. & LEES D. 1992. Tracks & Signs of the Birds of Britain and Europe. An identification Guide. Chistopher Helm & Black, Landen. 232 p. ISBN 0.7136.3523.1

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