Sun Tzu
Henry David Thoreau
Jules Verne
H. G. Wells
Mary Wollstonecraft Shelley
Various
Charles Darwin
Ayn Rand
Kurt Vonnegut
Henry Stanton
Albert Einstein
Marion Zimmer Bradley
Edgar Rice Burroughs
Robert Louis Stevenson
Niccolò Machiavelli
Henry Gray
Arnold Bennett
Murray Leinster
William Clark Russell
Garrett P. Serviss
Harry Harrison
Edwin Abbott Abbott
Andre Norton
Ernest Shackleton
Emma Goldman
J.G. M'Pherson
Thornton W. Burgess
H. Beam Piper
René Descartes
Thomas Hobbes
Mallanaga Vatsyayana
Thomas Paine
Thomas Henry Huxley
Lester Del Rey