funds made available to the Secretary pursuant to the provisions of sections 1705 and 1708 of this title, exclusive of amounts heretofore refunded, (a) for carrying out this subchapter and
section 484d of title 48 with respect to mortgages insured under
section 1709 of this title where such funds were credited to the general reinsurance account in the Mutual Mortgage Insurance Fund, and (b) for the payment of salaries and expenses with respect to mortgage insurance under sections 1713 and 1715a of this title where such funds were credited to the Housing Insurance Fund;