Social security amendments of 1970 : report of the Committee on Ways and Means, on H.R. 17550 to amend the Social Security Act to provide increases in benefits, to improve computation methods, and to raise the earnings base under the old-age, survivors, and disability insurance system, to make improvements in the Medicare, Medicaid, and Maternal and Child Health Program with emphasis upon improvemnents in the operating effectiveness of such programs, and for other purposes