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Italian artist, engineer, and scientist Leonardo da Vinci.

Leonardo da Vinci

(1452 - 1519)

Photograph of American environmentalist Aldo Leopold.

Aldo Leopold

(1887 - 1948)

Photograph of American novelist Jack London.

Jack London

(1876 - 1916)

Engraving of a bust of Lucretius.

Lucretius

(c. 95 BC - c. 50 BC)

English economist and demographer Thomas Malthus.

Thomas Malthus

(1766 - 1834)

Image of medieval traveler Sir John Mandeville.

John Mandeville

(c. 1300 - 1371)

American diplomat, scholar, and conservationist George Perkins Marsh.

George Perkins Marsh

(1801 - 1882)

Novelist and psychiatrist Daniel Mason.

Daniel Mason

Bill McKibben

Black and white image of American writer Herman Melville.

Herman Melville

(1819 - 1891)

Painted portrait of English poet John Milton.

John Milton

(1608 - 1674)

Giovanni Pico Della Mirandola

(1463 - 1494)

Oil painting portrair Michel de Montaigne in red robes and white collar

Michel de Montaigne

(1533 - 1592)

John Muir

(1838 - 1914)

Portrait of English physicist and mathematician Isaac Newton.

Isaac Newton

(1643 - 1727)

Black and white photograph of Friedrich Nietzsche with a huge mustache.

Friedrich Nietzsche

(1844 - 1900)

Novalis

(1772 - 1801)

American landscape architect Frederick Law Olmsted.

Frederick Law Olmsted

(1822 - 1903)

Black and white engraving of Roman poet Ovid in profile.

Ovid

(43 BC - c. 17)

Paracelsus

(1493 - 1541)

Engraving of Pliny the Elder.

Pliny the Elder

(23 - 79)

Engraving of Roman author and administrator Pliny the Younger.

Pliny the Younger

(61 - 112)

Photograph of journalist, author, and professor Michael Pollan.

Michael Pollan

English poet and satirist Alexander Pope.

Alexander Pope

(1688 - 1744)