Hi.
I am interested in Historical texts, specifically for mathematics. I want to go back to the source to see where key concepts and modern mathematical notation was introduced.
I have tried google, but mostly find modern transcripts, though very arbitrarily stumble upon what I want.
Examples of some books I am looking for:
Does anyone have any suggestions to where I should look?
gallica.bnf.fr is an awesome tool (very) often used by french scholars. Millions of historical documents are available on this website.
I did a quick search and most of the books you are looking for are available there.
This is what I actually do to pay the bills!
Scans of Euclid can be found at http://www.claymath.org/library/historical/euclid/
The Cambridge University Library hosts a number of scans that might interest you, including the 1687 edition of the Principia and other Newton papers.