CLASSICAL

http://www.classical-homeschooling.org/curriculum/scope-g.html

History

http://www.eduplace.com/ss/socsci/in/books/bke/ilessons/index.html

http://www.homelearninglifestyle.com/20th-century-american-history/

Big Free List

http://balancingtheroadlesstraveled.blogspot.com/p/free-homeschooling-resources.html