Western Region - Monthly Evening Lecture Series
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- Title: Dark Holes in Muir's "Range of Light"
- Subtitle: Insights from southern Sierra Nevada caves and karst
- Speaker: John Tinsley, Geologist
- Moderator: Leslie Gordon
- Date Recorded: August 30, 2007
- Length: 1 hour 23 Minutes
- Download video (MPEG 4/H.264): aug07.mp4