Bidahachi Lake, (Hopi Lake) Pg.209 Roadside geology of Arizona, by Halka Chronic
Hopi Lake, Page.182 In the Beginning, by Dr. Walter Brown
Meteor Crater, proposed age 22,000 years old, Pg.204 Roadside Geology of Arizona, by Halka Chronic
Meteor Crater, proposed age 49.000 yo, Wikipedia (Often times more dogmatic than scientific)