DUBLIN--(BUSINESS WIRE)--Research and Markets (http://www.researchandmarkets.com/research/qhg9r6/northern) has announced the addition of Rich's Business Directories, Inc's new directory "Northern California High Technology Directory, 27th Edition " to their offering. The fully-indexed, annual print directory featuring high tech companies and key contacts in Northern California. Package Stats Total Companies: 6,978 Total Contacts: 45,927 Total Companies Email: 4,968 Total Contacts Email: 2,528 A