pect to any assessments, rates, charg- 9 es, fees, revenues or other income received by the authority. 10 (b) Any bonds issued pursuant to this section, their transfer and the 11 income therefrom shall, at all times, be exempt from taxation except for 12 estate or gift taxes and taxes on transfers. 13 (c) The state hereby covenants with the purchasers and with all subse- 14 quent holders and trans