Here's a cool article on the building of Laguna Seca back in 1957. 8)
http://www.mazdaraceway.com/homepage-middle-pod/mazda-raceway-laguna-seca-60th-anniversary-retrospective-early-beginnings
http://www.mazdaraceway.com/homepage-middle-pod/mazda-raceway-laguna-seca-60th-anniversary-retrospective-early-beginnings