As interesting as the Santa Clara Valley fruit industry can be, there have been other booms in the Santa Clara Valley, and their stories are as good or better. Here's a few great links to the history of Silicon Valley: as the source of computer chips, microwave tubes and defense companies, or software.
Steve Blank's Secret History of Silicon Valley, told often through his experiences in the defense industry of the 1960's and 1970's. Steve's also well-known for his other stories about the chip and internet industries, as well as his ideas about startups and entrepreneurial spirit.
Not Even Silicon Valley Escapes History, from the Atlantic magazine. It's mostly focused on the toxic contamination left over from the early chip companies.
The Atlantic also generated a map of Silicon Valley based on a 1977 directory. It shows the offices of all the companies that came and went. Not surprisingly for its era, most of the former cannery districts - along Fourth Street or Auzerais Street in San Jose, in Campbell, or on the north side of San Jose - show no signs of tech life.