San Diego County LibraryAlpine Branch 1752 Alpine Blvd. Alpine, CA 91901 (619) 445-4221 www.sdcl.org Monday–Friday 10:00am-4:00pm24 hour drop off boxes to return books. San Diego County LibraryCampo / Morena Village Branch 31356 Hwy. 94 Campo, CA 91906 (619) 478-5945 www.sdcl.org Monday–Friday 10:00am-4:00pm24 hour drop off boxes to return books. San Diego County LibraryDescanso Branch 9645 River Dr. Descanso, CA 91916 (619) 445-5279 www.sdcl.org Monday–Friday 10:00am-4:00pm24 hour drop off boxes to return books. San Diego County LibraryJacumba Branch 44605 Old Hwy. 80 Jacumba, CA 91934 (619) 766-4608 www.sdcl.org Monday–Friday 10:00am-4:00pm24 hour drop off boxes to return books. San Diego County LibraryPine Valley Branch 28804 Old Hwy. 80 Pine Valley, CA 91962 (619) 473-8022 www.sdcl.org Monday–Friday 10:00am-4:00pm24 hour drop off boxes to return books. San Diego County LibraryPotrero Branch 24883 Potrero Valley Rd. Potrero, CA 91963 (619) 478-5978 www.sdcl.org Monday–Friday 10:00am-4:00pm24 hour drop off boxes to return books.