Investigators dig for bodies at Manson ranch site

• Story Highlights
• Nearly 20 scientists, law officers, park rangers involved in ranch excavation
  
• Search for victims will use methods unavailable when Manson, followers arrested
  
• Rugged terrain, high temperatures make work hard on diggers, forensic tools
  
• Charles Manson, followers hid at ranch after actress Sharon Tate, 6 others killed
  
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