Género
Conservación y protección ambiental
In the Open: Intimate Studies and Appreciations of Nature
Kirkham, Stanton Davis
Wanderings in South America
Waterton, Charles
Lyrics of Earth
Lampman, Archibald
The Crest of the Continent: A Summer's Ramble in the Rocky Mountains and Beyond
Ingersoll, Ernest
A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, México
Duellman, William Edward
The Country Beyond
Curwood, James Oliver
Pastoral Days; or, Memories of a New England Year
Gibson, W. Hamilton
I Walked in Arden
Crawford, Jack Randall
Prose Idylls, New and Old
Kingsley, Charles
Plantas vasculares
Carvajal-Rojas, Lyndon, Barrientos-Díaz, Ossman
Birds from Coahuila, Mexico
Urban, Emil K.
Cruise of the Revenue-Steamer Corwin in Alaska and the N.W. Arctic Ocean in 1881: Botanical Notes
Muir, John
A Year in the Fields
Burroughs, John
In the Catskills: Selections from the Writings of John Burroughs
Burroughs, John
Canadian Wilds
Hunter, Martin
Lobo, Rag and Vixen
Seton, Ernest Thompson
The Amateur Poacher
Jefferies, Richard
Anecdotes of Animals
Anonymous
Getting Acquainted with the Trees
McFarland, J. Horace
Rolf in the Woods
Seton, Ernest Thompson
Territorio en movimiento(s)
Giraldo, Isabel Cristina Tobón
Notes on Collecting and Preserving Natural-History Objects
Various
Our National Forests
Boerker, Richard H. D.
North American Recent Soft-Shelled Turtles (Family Trionychidae)
Webb, Robert G.