55 STAT.] 77TH CONG., 1ST SESS.-CH. 259-JUNE 28, 1941 establishment from which the transfer is made: Provided, That any sums transferred by any department or independent establishment of the Government to the Geological Survey for cooperative work in connection with this appropriation may be expended in the same manner as sums appropriated herein may be expended: Providedfur- ther, That any funds herein appropriated for the Geological Survey for cooperative work may be utilized prior to July 1, 1941, as required to enable the Geological Survey to continue its cooperative work pending reimbursement from cooperative agencies, the amount required for such cooperative work to be placed to the credit of the 1941 appropriation account of the Geological Survey and subse- quently repaid to the appropriation from which advanced; During the fiscal year 1942, upon the request of the Secretary of the Interior, the Secretary of War or the Secretary of the Navy is authorized to furnish aerial photographs required for mapping proj- ects, insofar as the furnishing of such photographs will be econom- ical to the Federal Government and does not conflict with military or naval operations or the other parts of the regular training pro- gram of the Army, Navy. and Marine Corps flying services, and the Secretary of the Interior is authorized to reimburse the War or Navy Department for the cost of making the photographs, such cost to be confined to the actual cost of gasoline, oil, film, paper, chemicals, and the labor performed in developing the photographic negatives and the printing of copies of photographs, and the per diem expenses of the personnel authorized by law, together with such incidental expenses as care and minor repairs to plane and transportation of personnel to and from projects, and the War Department or the Navy Department, on request of the Department of the Interior, is authorized to furnish copies to any State, county, or municipal agency cooperating with the Federal Government in the mapping project for which the photographs were taken. In the event that the Director of the Geological Survey deems it advantageous to the Government, the Geological Survey is authorized to contract with civilian aerial photographic concerns for the furnishing of such photographs or for the furnishing of topographic maps made from such photographs; In all, salaries and expenses, United States Geological Survey. $4,923,900. BUREAU OF MINES SALARIES AND GENERAL EXPENSES Salaries and general expenses: For general expenses, including pay of the Director and necessary assistants, clerks, and other employees, in the office in the District of Columbia and in the field, and every other expense requisite for and incident to the general work of the Bureau in the District of Columbia and in the field, to be expended under the direction of the Secretary of the Interior, $67,900, of which amount not to exceed $55,340 may be expended for personal services in the District of Columbia; Operating mine rescue cars and stations and investigation of mine accidents: For the investigation and improvement of mine-rescue and first-aid methods and appliances and the teaching of mine safety, rescue, and first-aid methods; investigations as to the causes of mine explosions, causes of falls of roof and coal, methods of mining, espe- cially in relation to the safety of miners, the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the use of explosives and 341 Provisos. Expenditure. Cooperative work; availability of funds. Aerial photographs for mapping projects. Copies. Contracts with civil- ian concerns. ' I'otal. Iow,pp.I ,553 ,684,752, S27.
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