02245cam a22003253u 450000100060000000300070000600500170001300600020003000700050003200800410003701000160007804000110009404100170010505000070012210000430012924500490017226400510022130000470027233600260031933700260034533800360037149000520040750000310045950800790049052011870056953400450175665300230180183000520182485600430187665265UtSlPG20260610134515.0mcr n260607r2021||||utu|||||o|||||||||||||| d  aagr36000014  aUtSlPG 7aen2iso639-1 4aQL1 aLincoln, Frederick Charles,d1892-196014aThe Migration of North American Birds (1935) 1aSalt Lake City, UT :bProject Gutenberg,c2021  a1 online resource :bmultiple file formats  atextbtxt2rdacontent  acomputerbc2rdamedia  aonline resourcebcr2rdacarrier1 aU.S. Department of Agriculture circular no. 363  aRelease date is 2021-05-05  aTom Cosmas produced from materials made available on The Internet Archive.  a"The Migration of North American Birds" by Frederick Charles Lincoln is a scientific publication written in the mid-20th century. This work thoroughly examines the patterns, behaviors, and phenomena associated with the migration of birds across North America. It discusses various theories on why and how birds migrate, details about their migratory routes, and the historical context of these natural occurrences.  The opening of the book sets the stage by presenting a series of thought-provoking questions regarding the seasonal disappearance and reappearance of migratory birds. It addresses the curiosity about their routes, the dangers they face during migration, and the importance of understanding these phenomena for conservation efforts. Lincoln emphasizes the long history of interest in bird migrations, referencing ancient observations, and he outlines the extensive research conducted by the Biological Survey which provides the backdrop for the book's exploration of avian migration patterns. This introduction establishes a framework for understanding the complexity and significance of bird migrations in North America. (This is an automatically generated summary.)  nOriginal publication data not identified  aBirds -- Migration 0aU.S. Department of Agriculture circular no. 36340uhttps://www.gutenberg.org/ebooks/65265