Mathematics
Free to read here, from Project Gutenberg.
The Foundations of Science: Science and Hypothesis, The Value of Science, Science and Method
Mysticism and Logic and Other Essays
Principia mathematica, vol. 1 (of 3)
1001 задача для умственного счета
The Way To Geometry
The Fibonacci Number Series
Introduction to Mathematical Philosophy
An Introduction to Mathematics
The Mathematicall Praeface to Elements of Geometrie of Euclid of Megara
Mathematical Recreations and Essays
Memorabilia Mathematica; or, the Philomath's Quotation-Book
Œuvres mathématiques d'Évariste Galois
The philosophy of mathematics
Principia mathematica, vol. 2 (of 3)
A List of Factorial Math Constants
Science and hypothesis
The Number "e"
A History of Mathematics
The Earliest Arithmetics in English
The Second Story of Meno
Mathematical Problems
William Oughtred: A Great Seventeenth-Century Teacher of Mathematics
Mathématiques et Mathématiciens: Pensées et Curiosités
Curiosa mathematica, part II
A Short Account of the History of Mathematics
Elémens de la philosophie de Neuton: Mis à la portée de tout le monde
Geschichte der Mathematik im Altertum in Verbindung mit antiker Kulturgeschichte
Five of Maxwell's Papers
The golden mean
The Value of Zeta(3) to 1,000,000 places
The Golden Mean or Ratio[(1+sqrt(5))/2]
The First 498 Bernoulli Numbers
The First 1000 Euler Numbers
The First 1001 Fibonacci Numbers
Lectures on Elementary Mathematics
On the study and difficulties of mathematics
Curiosa mathematica, Part 1
History of Modern Mathematics
The Evanston Colloquium: Lectures on Mathematics
Mathematical Essays and Recreations
Lectures on Ten British Mathematicians of the Nineteenth Century
The number-system of algebra treated theoretically and historically (2nd edition)
Elementare Arithmetik und Algebra
Journal de mathématics pures et appliquées, Tome deuxième, année 1837
Synthetische Geometrie der Kugeln und linearen Kugelsysteme mit einer Einleitung in die analytische Geometrie der Kugelsysteme