52 STAT.] 75TH CONG., 3D SESS.-CH. 180-APR. 27, 1938 ing apparel, and suitable equipment for aviation purposes; and for the acquisition of the necessary sites by lease or grant, $4,575,000 of which amount $2,000,000 shall be available for the payment of contractual obligations authorized to be incurred prior to July 1, 1938, by the first proviso under this head in the Department of Com- merce Appropriation Act, 1938: Provided, That in addition to the amount herein appropriated, the Secretary of Commerce may, prior to July 1, 1939, enter into contracts for the purchase, construction, and installation of additional air navigation aids not in excess of $2,000,000 which authorization is in lieu of, and not in addi- tion to, the authorization contained in said proviso to incur contractual obligations in the same amount prior to July 1, 1939: Provided further, That the Secretary of Commerce before entering into any such contract shall personally certify that in his opinion it is necessary in the public interest: Provided further, That a full report of all such certifications and of all expenditures under this item shall be made to Congress on or before July 1, 1939. Maintenance of air-navigation facilities: For all necessary expenses of operation, maintenance, and upkeep of existing aids to air navi- gation, including purchase, exchange, maintenance, operation, and repair of motor-propelled passenger-carrying vehicles; purchase of special clothing, wearing apparel, and suitable equipment for avia- tion purposes (including rubber boots, snowshoes, and skis); books of reference and periodicals; $6,758,680. Aircraft in commerce: To carry out the provisions of the Act approved May 20, 1926, entitled "An Act to encourage and regulate the use of aircraft in commerce, and for other purposes", as amended by the Act approved February 28, 1929, and the Acts approved June 19, 1934 (49 U. S. C. 171-184), including personal services in the field; control of air traffic on civil airways at air terminals, includ- ing necessary equipment therefor; rent in the District of Columbia and elsewhere; contract stenographic reporting services; fees and mileage of witnesses; purchase of furniture and equipment: sta- tionery and supplies, including medical supplies, typewriting, adding, and computing machines, accessories, and repairs; purchase, includ- ing exchange (not to exceed $10,000), maintenance, operation, and repair of motor-propelled passenger-carrying vehicles for official use in field work; purchase of special clothing, wearing apparel, and similar equipment for aviation purposes; purchase of books of ref- erence and periodicals; newspapers, reports, documents, plans specifications, maps, manuscripts, and other publications; and all other necessary expenses not included in the foregoing; in all, $1,249,800. Safety and planning: Further to carry out the provisions of the Act approved May 20, 1926, entitled "An Act to encourage and regulate the use of aircraft in commerce, and for other purposes", as amended by the Act approved February 28, 1929, and the Acts approved June 19, 1934, through safety research relative to aviation equipment, personnel, and operation methods; including not to exceed $75,000 for personal services in the District of Columbia and not to exceed $80,000 for personal services in the field; not to exceed $1,000 for the purchase of books of reference and periodicals; purchase of reports, documents, plans, specifications, and manuscripts; mainte- nance, repair, and operation of motor-propelled passenger-carrying vehicles; and all other necessary expenses, $258,000. Purchase and maintenance of aircraft: For all necessary expenses except personal services of Bureau of Air Commerce employees, of purchase, including exchange, operation, maintenance, repair, and overhaul of aircraft, aircraft power plants, propellers, and equipment, 271 Prorios. Contracts author- ized. Certificate of neces- sity. Report to Congress. Maintenance of air- navigation facilities. Aircraft in com- merce. Services and ex- penses. 44 Stat. 568; 48 Stat. 1113. 49 U.S. c.c. 171- 184. Safety and plan- ning. 44 Stat. 88; 45 Stat. 1404; 48 Stat. 1113. 49U.S.c.. 171- 184. Purchase, etc., of aircraft.
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