Mountain Press Publishing Missoula Montana
Halka Chronic
Halka Chronic earned degrees from the University of Arizona and Stanford and a PhD in geology from Columbia University. Among the ten geology guidebooks she wrote were Roadside Geology guides for Arizona, Colorado, and New Mexico. Halka passed away in Grand Junction, Colorado, in April 2013.

Works:
   Roadside Geology of Arizona
   Roadside Geology of Colorado
   Roadside Geology of Utah
   Roadside Geology of New Mexico