The board is specifically authorized to use relief labor in the production of agricultural lime as provided for in this chapter , but shall pay the prevailing labor scale for that type of work, customary in that vicinity. [C39, § 3142.19; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §202.11 ] C93, §353.11