Bird Census Techniques, Second Edition
"...well illustrated with explanatory diagrams...An essential reference for anyone engaged in bird census studies."- NORTHEASTERN NATURALIST"...relevant to ornithological field researchers, both amateur and professional, and ecologists and conservation biologists undergoing census studies of wild bird populations..."-ETHOLOGY"...a 'must' for any bird-surveyors, volunteer and professional alike..."-Juliet Vickery in BRITISH BIRDS