Letter from the Secretary of the Interio : transmitting a report on the Auburn-Folsom South Unit proposing expansion of the Central Valey Project in California, pursuant to section 9(a) of the reclamation project act of 1939 (53 stat. 1187), and section 2 of the American River basin development act of October 14, 1949 (63 stat. 852) (House Document ;, 1962)