At any time before all the bonds held by the State Treasurer have been sold by him, the board may:
(a) Draw upon the State Treasurer for, and issue and deliver any unsold bonds at not less than their face value in payment for any of the works or other expenses for which the assessment has been levied and for which bonds have been authorized.
(b) Make contracts for any of the works or expenses, payable in whole or in part in bonds.
(Added by Stats. 1943, Ch. 369.)