Impressive work. A LOT of work. It would be nice to continue to improve the accuracy.

Here are four corrections in Northern California that I noticed while browsing:

Sonoma Mountain 38.353727� -122.542190�
Mount Harlan 36.702915� -121.382308�
Russian River 38.536061� -122.865613�
Cole Ranch 39.136063� -123.502208�