If the recorded instruments or the record books in the office of the recorder have been microfilmed for preservation purposes, a type of record book may be used which will permit the removal of leaves in order that reproduction may be made in an efficient manner.
In order to microfilm or otherwise reproduce the record books for preservation purposes, permanently bound record books may be disassembled and after they have been copied such books shall be rebound in a type of record book which will permit the removal of leaves in order that reproduction may be made in an efficient manner.
Source:
Section 27322.3, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV§ionNum=27322.3..