Bird neighbors [elektronický zdroj] : an introductory acquaintance with one hundred and fifty birds commonly found in the gardens, meadows, and woods about our homes / by Neltje Blanchan ; introduction by John Burroughs..    Champaign, Ill. : Project Gutenberg, [199-?] . 1 online resource. . ISBN 0585013063 (electronic bk.). ISBN 9780585013060 (electronic bk.)