Mathematics

Free to read here, from Project Gutenberg.

The Foundations of Science: Science and Hypothesis, The Value of Science, Science and Method

Henri Poincaré

Mysticism and Logic and Other Essays

Bertrand Russell

Principia mathematica, vol. 1 (of 3)

Alfred North Whitehead and Bertrand Russell

1001 задача для умственного счета

Sergei Aleksandrovich Rachinskii

Russian

The Way To Geometry

Petrus Ramus

The Fibonacci Number Series

Michael Husted

Introduction to Mathematical Philosophy

Bertrand Russell

An Introduction to Mathematics

Alfred North Whitehead

The Mathematicall Praeface to Elements of Geometrie of Euclid of Megara

John Dee

Mathematical Recreations and Essays

W. W. Rouse Ball

Memorabilia Mathematica; or, the Philomath's Quotation-Book

Robert Édouard Moritz

Œuvres mathématiques d'Évariste Galois

Évariste Galois

French

The philosophy of mathematics

Auguste Comte

Principia mathematica, vol. 2 (of 3)

Alfred North Whitehead and Bertrand Russell

A List of Factorial Math Constants

Unknown

Science and hypothesis

Henri Poincaré

The Number "e"

Unknown

A History of Mathematics

Florian Cajori

The Earliest Arithmetics in English

Robert Steele

The Second Story of Meno

Unknown

Mathematical Problems

David Hilbert

William Oughtred: A Great Seventeenth-Century Teacher of Mathematics

Florian Cajori

Mathématiques et Mathématiciens: Pensées et Curiosités

A. Rebière

French

Curiosa mathematica, part II

Lewis Carroll

A Short Account of the History of Mathematics

W. W. Rouse Ball

Elémens de la philosophie de Neuton: Mis à la portée de tout le monde

Voltaire

French

Geschichte der Mathematik im Altertum in Verbindung mit antiker Kulturgeschichte

Max Simon

German

Five of Maxwell's Papers

James Clerk Maxwell

The golden mean

Jerry T. Bonnell and Robert J. Nemiroff, also an audiobook

The Value of Zeta(3) to 1,000,000 places

Simon Plouffe

The Golden Mean or Ratio[(1+sqrt(5))/2]

Anonymous

The First 498 Bernoulli Numbers

Simon Plouffe

The First 1000 Euler Numbers

Simon Plouffe

The First 1001 Fibonacci Numbers

Simon Plouffe

Lectures on Elementary Mathematics

J. L. Lagrange

On the study and difficulties of mathematics

Augustus De Morgan

Curiosa mathematica, Part 1

Lewis Carroll

History of Modern Mathematics

David Eugene Smith

The Evanston Colloquium: Lectures on Mathematics

Felix Klein

Mathematical Essays and Recreations

Hermann Schubert

Lectures on Ten British Mathematicians of the Nineteenth Century

Alexander Macfarlane

The number-system of algebra treated theoretically and historically (2nd edition)

Henry B. Fine

Elementare Arithmetik und Algebra

Hermann Schubert

German

Journal de mathématics pures et appliquées, Tome deuxième, année 1837

Various

French

Synthetische Geometrie der Kugeln und linearen Kugelsysteme mit einer Einleitung in die analytische Geometrie der Kugelsysteme

Theodor Reye

German

Sechs Vorträge über ausgewählte Gegenstände aus der reinen Mathematik und mathematischen Physik

Henri Poincaré

German, French