Descartes Websites
philosophybasics.com
The Basics of Philosophy: A huge subject broken down into manageable chunks
121,459 
$ 91,200.00
earlymoderntexts.com
A selection of philosophy texts by philosophers of the early modern period, prepared with a view to making them easier to read while leaving intact the main arguments,...
304,544 $ 27,000.00
storyofmathematics.com
The Story of Mathematics - A History of Mathematical Thought from Ancient Times to the Modern Day
273,439 $ 30,240.00