PUBLIC LAWS-CH. 409-AUG. 25, 1941 DEPARTMENT OF COMMERCE Ante, p. 279. Airport traffic-con - trol towers. Proiso. Automobiles. Ante, p. 279. Ante, p. 280 . Airport traffic-con - trol towers. Ante, p. 281 . Ante, p. 342 . Ante, p. 343 . Personal services. OFFICE OF ADMINISTRATOR OF CIVIL AERONAUTICS Maintenance and operation of air-navigation facilities: For an addi- tional amount for maintenance and operation of air-navigation facil- ities, fiscal year 1942, including the objects specified under this head- ing in the Department of Commerce Appropriation Act, 1942, $1,100,000, of which not to exceed $500,000 shall be available for the maintenance and operation of airport traffic-control towers whenever the Secretary of War or Secretary of the Navy shall certify that the accomplishment of such work is essential to the national defense: Provided, That the limitation on the purchase and exchange of pas- senger-carrying automobiles under this heading in the Commerce Department Appropriation Act, 1942, is hereby increased from $13,550 to $29,300. Establishment of air-navigation facilities: For an additional amount for the establishment of air-navigation facilities, fiscal year 1942, including the objects specified under this heading in the Depart- ment of Commerce Appropriation Act, 1942, $5,586,000, of which not to exceed $500,000 shall be available for the establishment of air- port traffic-control towers whenever the Secretary of War or Secretary of the Navy shall certify that the accomplishment of such work is essential to the national defense. Development of landing areas: For an additional amount for the appropriation "Development of Landing Areas", $5,500,000, of which $300,000 shall be available for administrative expenses, including engineering services and supervision of construction. INTERIOR DEPARTMENT BUREAU OF MINES Testing fuel: For an additional amount for testing fuel, fiscal year 1942, including the objects specified under this head in the Interior Department Appropriation Act, 1942, $28,500, and the limitation of $35,000 contained in said Act under this head for personal services in the District of Columbia is hereby increased to $40,250. Investigation of domestic sources of mineral supply: For an addi- tional amount for investigation of domestic sources of mineral supply, fiscal year 1942, including the objects specified under this head in the Interior Department Appropriation Act, 1942, $300,000, and the limitation of $25,000 contained in said Act under this head for personal services in the District of Columbia is hereby increased to $32,500. Investigation of raw material resources for western steel produc- tion: For all expenses necessary to enable the Bureau of Mines to investigate by subsurface exploration the amount and quality of iron ores, limestone, and coking coals essential to expanding steel pro- duction in States in which such deposits may exist, including all nec- essary laboratory research; preliminary examination and subsurface exploration of raw materials; supplies and equipment; traveling expenses; not to exceed $13,000 for personal services in the District of Columbia; printing and binding; purchase in the District of Columbia and elsewhere of furniture and equipment, professional and scientific books and publications, stationery and supplies, typewriting. adding, computing, and addressing machines, and other labor-saving devices, accessories, and repairs, including exchange and maintenance thereof, and purchase of such personal wearing apparel or equipment as may be required for the protection of employees while engaged in [55 STAT. 684
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