James L. Roark Michael P. Johnson Patricia Cline Cohen Sarah ...
adapted agriculture because dry climate and fluctuations in rainfall made the supply of wild plant food unreliable; began cultivating corn around 3500 BP; planting corn required Southwestern Indians to restrict migrations to tend to the crop and to develop irrigation...IMPROVED TRIBAL OPERATOR SERVICES THROUGH PARTNERSHIPS Presentation at
Inter Tribal Council of Arizona. Regions 5-10. 95% of all Tribal public water systems (956 total) USET. United South & Eastern Tribes. Regions 1-4. The ITCA National Tribal Water & Wastewater Operator Certification Program. Operator Certification and NAWMA's.