Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Ludwig Wittgenstein
Gottlob Frege
Charles Frederick Kroeh
Emil Weyr
Max Simon
Friedrich Dannemann
Marie Curie
Felix Klein
Friedrich August Theodor Winnecke
Gino Loria
Erwin Eggert
Karl Doehlemann
A. Schoenflies
Wilhelm Max Wundt
Gertrude Lowthian Bell
Rudolf Rothe
Sophus Lie
F. G. Normann
Hermann Schubert
Max Planck
Kurt Hensel
Theodor Reye
H. E. Timerding
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.