When the issuance of bonds shall have been authorized pursuant to two or more propositions submitted at the same or different elections, all or any part of said bonds not theretofore issued may be combined and issued and sold as a single issue or series.
Source:
Section 29910.2, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV§ionNum=29910.2..