The recorder shall, as rapidly as his facilities permit, index and record such original documents in his possession as affect the title to or possession of real property and which were filed on or after January 1, 1935, and which have not been merged into a certificate of title or certificate of guaranteed claim. The recorder may preserve all documents, books and records in his possession by the process of photography or microphotography and such copies, when properly certified by the recorder, shall be considered duplicate originals.

SOURCE: GC § 13134.