Chaco Canyon was once the vibrant religious center of a Native American culture whose collapse long remained a mystery—until ...

The physical dimensions of the Eft-90 components are listed in Table 1. This is the preferred layout for ease of use and serviceability. The optimal area is 10 ft by 6 ft, 60 ft 2 (5.57 m 2).

Mesa Verde National Park in southwestern Colorado is one such park. For over 700 years (550 – 1300 CE), Ancestral Puebloans made Mesa Verde their home. They built elaborate brick-and-mortar structures ...