Dr. Ken has written an article:

Why California’s Trails Are Disappearing From Our Maps

The Sierra Once Provided Refuge for the Central Valley; Now, Access to These Forests Is Being Threatened

by Ken Murray|January 24, 2014

On Zocalo Public Square

It ran in the Fresno Bee on Saturday.
Google also shows it on other websites:
Valley Public Radio
The Bakersfield Californian