For the purpose of cooperating in the carrying out and completion of the plan approved in Section 8525, and on condition that the United States will likewise cooperate in the carrying out of the plan and, to that end, will appropriate and make available to the extent that it has not already done so, substantially the same amount as the State as recommended in the plan, appropriations will be made by the State from time to time by law, which, together with amounts heretofore appropriated by the State in aid of the plan, will not exceed in the aggregate seventeen million seven hundred thousand dollars ($17,700,000).