Bibliotecas digitales de libros antiguos escaneados de cientificos ilustres - Digital libraries of old books scanned illustrious scientists

Bibliotecas digitales de libros antiguos escaneados de cientificos ilustres
Digital libraries of old books scanned illustrious scientists

http://library.si.edu/digital-library/book/nicolaicopernici00cope

https://archive.org/details/nicolaicopernici00cope

http://digitalcollections.nypl.org/items/8ad14dd4-207e-253f-e040-e00a18063b5f

http://www.inyourpocket.com/

http://babel.hathitrust.org/cgi/pt?id=uc2.ark:/13960/t9r20v31z;view=1up;seq=8