Nice to meet you all, i am a physical chemist and did my chemistry PhD
researching about history of chemistry.
During my studies i had a great difficulty in finding do***ents as i
preferred to do my research on primary fonts, in particular for
do***ents before 1850. But there is an exceptional on line resource
that is full of scanned ancient do***ents, papers, monographies and so
on. I hope this could be useful and interesting for you.
The site is french.
http://gallica.bnf.fr/
Vive la France!