Great books of the Western World - Volume 40
Encyclopaedia Britannica, Inc.
ECMA-408, 2nd edition, December 2014
ECMA
Logic in Linguistics
Jens Allwood & Lars-Gunnar Andersson & Osten Dahl
Twentieth-Century Philosophy: The Analytic Tradition
Morris Weitz
The Concise Encyclopedia of Western Philosophy
J. O. Urmson & Jonathan Rée
CK-12 Algebra I Teacher's Edition
Ck-12 Foundation
CK-12 Trigonometry - Second Edition