Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Robert DeCourcy Ward
James Geikie
Ellsworth Huntington and Stephen Sargent Visher
C. E. P. Brooks
James Croll
George Michael James Giles
Wilhelm Bölsche
Marsden Manson
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.