The database America: History and Life with Full Text includes many hundreds of articles discussing aspects of the Texas Panhandle in such journals as the Panhandle-Plains Historical Review, the West Texas Historical Association Yearbook, and many others.
You can search there for a string such as
Amarillo OR (Texas Panhandle) OR "Randall County" OR "Potter County"
and change from "Select a field (optional)" to "TX All Text" and get over 1,400 results.