00571cam a2200181 4500 377043092 TxAuBib 20170330120000.0 160620s2016||||||||||||||||||||||||eng|u 52382 Project Gutenberg PGUSA eng TxAuBib Mengel, Robert Morrow, 1921- Studies of Birds Killed in Nocturnal Migration [Gutenberg] / Robert Morrow Mengel. Project Gutenberg, 2016. Public domain in the USA. Text. Birds -- Migration. http://www.gutenberg.org/ebooks/52382