Rock City
2018
Plants of Twin Peaks
2018
Black Diamond Mines
2018
A Geology Tour on the Mary Bowerman Trail
2017
Introducing Mount Diablo
2017
Mitchell Canyon
2017
Trail Through Time
2016
Perkins Canyon
2014
Los Vaqueros
2014
Curry Point
2012
Lime Ridge
2012
Round Valley
2012
Grand Loop
2010