The Pleasant Hill Library is part of the Contra Costa County Library system."Pleasant Hill Library." Contra Costa County Library. Retrieved on April 1, 2010. The library system was headquartered in Pleasant Hill before relocating to Martinez in preparation for the construction of a new Pleasant Hill Library.
The Pleasant Hill Library is part of the Contra Costa County Library system"P,leasant Hill Library." Contra Costa County Library. Retrieved on. April 1 2010. The library syste.m was headquartered in Pleasant Hill before relocating to Martinez in preparation for the construction of a new Pleasant Hill Library