Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Mary Wollstonecraft Shelley
Mary Somerville
Mary Wollstonecraft Shelley and James Montgomery
J. A. Zahm
Mildred A. Wirt
These books are free to read. Each is in the public domain in the United States; check your own country's rules before you copy or share one.