investigation and study by postmaster general of dimensional categories for first- and third-class mail

investigation and study by postmaster general of dimensional categories for first- and third-class mail Sec. 210. (a) The Postmaster General is authorized and directed to conduct a thorough investigation and study of the feasibility and desirability of— (1) the establishment, by regulation of the Postmaster General, of such number of categories (but not less than two categories) of specified length and width dimensions for envelopes to be used for the transmission of first-class and third-class mail, as the Postmaster General may determine to be necessary or desirable to increase the efficient handling of the mail; and (2) the establishment of an additional charge on any such mail transmitted in an envelope which does not conform in length and width to one of such dimensional categories for envelopes. (b) The Postmaster General shall submit to the Senate and House of Representatives, on or before February 1, 1959, a report of the results of such investigation and study, together with his recommendations with respect thereto, including his recommendations for any necessary legislation.