Peterson's guides have been a mainstay for birders since his first publication in 1934.
Revised in 2010 with updated text, paintings and range maps, Birds of Eastern & Central North America covers 500 species (sixth edition, 464 pages, 5" x 8").
The 2008 edition of Peterson Field Guide to Birds of North America is a compilation of species in the eastern/central and western regions (544 pages, 6" x 9").
Both have Smyth-sewn, flexible-back bindings with vinyl covers. They include a website link to access video podcasts that supplement the books.