The City of San Diego Public Library: eLibary Resources
About half-way down the page there is a section labled, “Business & Careers.” Click on this section to expand its contents. It contains many valuable resources for business use.
Data Axle | Reference Solutions (Formerly ReferenceUSA)
Reference Solutions is a powerful online tool for compiling detailed contact lists for sales/marketing campaigns. It provides instant, real-time access to accurate, in-depth information on U.S. businesses (59 million) and U.S. residents (310 million).