graders. Additional grades were added in 2014 and 2015 resulting in a student body of approximately 500. Services The San Diego Public Library system currently consists of the Central Library, 35 branch libraries, and an adult literacy program office (READ/San Diego). Library cards are free to applicants who reside within the state of California or own property in the city of San Diego, and to men and women serving in the armed forces who are stationed within San Diego County. Library cards are permanent and must be renewed every two years. There is a $30 annual fee for a non-resident library card. On the third floor of the Central Library is the new Innovation Lab that was originally funded by a state Library Services and Technology Act grant in 2013, when the Central Library opened. Since then, thanks to donations from the community, the lab has expanded and added additional machines. The new space was funded in part by the California State Library. Available equipment and resources from the Innovation Lab include: 3D Printing & Scanning Silhouette Cameos/Vinyl Cutter Sewing & Embroidery Machines Milling Machine Laser Cutter Computers Maker Classes & Workshop In fiscal year 2006, the Library system had a circulation of more than 7 million and more than 6 million visits by patrons. The San Diego Public Library was one of the first major library systems in the United States to offer free wireless Internet access at all of its locations, including the Central Library and branch libraries. While testing the Spirit of St. Louis airplane in San Diego, Charles Lindbergh used the resources at the San Diego Public Library to plot the course for his historic solo flight across the Atlantic Ocean. Renowned American sculptor Donal Hord bequeathed to the San Diego Public Library his lifelong collection of books and several sculptures in appreciation for the assistance he had received from library's staff over the years. Branches Aside from the Central Library, the system includes the following 35 branches: Allied Gardens/Benjamin Balboa Carmel Mountain Carmel Valley City Heights/Weingart Branch Library & Performance Annex Clairemont College-Rolando Kensington-Normal Heights La Jolla/Riford Linda Vista Logan Heights Mira Mesa Mission Hills-Hillcrest/Harley & Bessie Knox Mission Valley Mountain View/Beckwourth North Clairemont North Park North University Community Oak Park Ocean Beach Otay Mesa-Nestor Pacific Beach/Taylor Paradise Hills Point Loma/Hervey Rancho Bernardo Rancho Peñasquitos San Carlos San Ysidro Scripps Miramar Ranch Serra Mesa-Kearny Mesa