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Conservación y protección ambiental

Portada del libro «Description of a New Softshell Turtle from the Southeastern United States», de Robert G. Webb

Description of a New Softshell Turtle from the Southeastern United States

Webb, Robert G.

Portada del libro «James Oliver Curwood, Disciple of the Wilds», de Hobart Donald Swiggett

James Oliver Curwood, Disciple of the Wilds

Swiggett, Hobart Donald

Portada del libro «Bears I Have Met—and Others», de Allen Kelly

Bears I Have Met—and Others

Kelly, Allen

Portada del libro «The Silent Places», de Stewart Edward White

The Silent Places

White, Stewart Edward

Portada del libro «Adventures of a Young Naturalist», de Lucien Biart

Adventures of a Young Naturalist

Biart, Lucien

Portada del libro «Dickey Downy: The Autobiography of a Bird», de Virginia Sharpe Patterson

Dickey Downy: The Autobiography of a Bird

Patterson, Virginia Sharpe

Portada del libro «The Toilers of the Field», de Richard Jefferies

The Toilers of the Field

Jefferies, Richard

Portada del libro «The Spell of the Rockies», de Enos A. Mills

The Spell of the Rockies

Mills, Enos A.

Portada del libro «The Rocky Mountain Wonderland», de Enos A. Mills

The Rocky Mountain Wonderland

Mills, Enos A.

Portada del libro «Observations on the Mississippi Kite in Southwestern Kansas», de Henry S. Fitch

Observations on the Mississippi Kite in Southwestern Kansas

Fitch, Henry S.

Portada del libro «God's Country: The Trail to Happiness», de James Oliver Curwood

God's Country: The Trail to Happiness

Curwood, James Oliver

Portada del libro «A Bird-Lover in the West», de Olive Thorne Miller

A Bird-Lover in the West

Miller, Olive Thorne

Portada del libro «Camping & Tramping with Roosevelt», de John Burroughs

Camping & Tramping with Roosevelt

Burroughs, John

Portada del libro «On Naval Timber and Arboriculture», de Patrick Matthew

On Naval Timber and Arboriculture

Matthew, Patrick

Portada del libro «Watched by Wild Animals», de Enos A. Mills

Watched by Wild Animals

Mills, Enos A.

Portada del libro «Nature's Teachings: Human Invention Anticipated by Nature», de J. G. Wood

Nature's Teachings: Human Invention Anticipated by Nature

Wood, J. G.

Portada del libro «The Seer of Slabsides», de Dallas Lore Sharp

The Seer of Slabsides

Sharp, Dallas Lore

Portada del libro «My Tropic Isle», de E. J. Banfield

My Tropic Isle

Banfield, E. J.

Portada del libro «Wake-Robin», de John Burroughs

Wake-Robin

Burroughs, John

Portada del libro «The Earth as Modified by Human Action», de George P. Marsh

The Earth as Modified by Human Action

Marsh, George P.

Portada del libro «Roof and Meadow», de Dallas Lore Sharp

Roof and Meadow

Sharp, Dallas Lore

Portada del libro «Bird Stories from Burroughs», de John Burroughs

Bird Stories from Burroughs

Burroughs, John

Portada del libro «Wakulla», de Kirk Munroe

Wakulla

Munroe, Kirk

Portada del libro «Wild Life on the Rockies», de Enos A. Mills

Wild Life on the Rockies

Mills, Enos A.