The board may enter into any deeds of trust, indentures, or other agreements with any bank or trust company, or other person in the United States having power to enter into such agreements, including any federal agency, as security for such bonds, and may assign and pledge the revenues, rentals, or receipts of the board thereunder. The deeds of trust, indentures, or other agreements may contain such provisions as are customary in the instruments, or as the board authorizes, including but without limiting provisions as to: