Extension of SEC institutional investor study : hearing before the Subcommittee on Commerce and Finance of the Committee on Interstate and Foreign Commerce, House of Representatives, Ninety-first Congress, first session on H.R. 11608, H.J. Res. 754, and S.J. Res. 112, to amend the Securities Exchange Act of 1934 to extend the time and increase the authorization for the institutional investor study, September 15, 1969