Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
A. F. R. Wollaston
Ernest Ingersoll
James Edmund Harting
John James Audubon
W. H. Hudson and Philip Lutley Sclater
Alfred Edmund Brehm
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Various
William Beebe and Blair Niles
James Roxburgh McClymont
Archibald Geikie
Joseph Grinnell and Elizabeth Grinnell
Bradford Torrey
Nuttall Ornithological Club
John Muir
W. L. Alden
These books are free to read. Each is in the public domain in the United States; check your own country's rules before you copy or share one.