Era 1_ 13.82 Billion Years - Future (1/2) - OER Project

Era 1_ 13.82 Billion Years - Future (2/2) - OER Project

Era 2_ Early Humans (1/2) - OER Project

Era 2_ Early Humans (2/2) - OER Project

Era 3_ Cities, Societies, and Empires (1/2) - OER Project

Era 3_ Cities, Societies, and Empires (2/2) - OER Project

Era 4_ How do societies react to catastrophe (1/2) - OER Project

Era 4_ How do societies react to catastrophe (2/2) - OER Project

Era 5_ How the columbian exchange changed the world (1/2) - OER Projec...

Era 5_ How the columbian exchange changed the world (2/2) - OER Projec...

Era 6_ The Long 19th Century (1/2) - OER Project

Era 6_ The Long 19th Century (2/2) - OER Project

Era 7_ The Great Convergence and Divergence (1/2) - OER Project

Era 7_ The Great Convergence and Divergence (2/2) - OER Project