60 STAT.] 79TH CONG. , 2D SESS.-CH. 529-JULY 1, 1946 schools oe pupils who are dependents of such persons: Provided fur- ther, That pursuant to agreements approved by the Secretary, the transportation equipment available to the Bureau of Mines may be pooled with that of school districts and other local or Federal agen- cies for use in transporting persons engaged in operation and mainte- nance of these plants, pupils who are dependents of such persons, and other pupils, and in the interest of economy the expenses of operating such equipment may be shared. Mineral mining investigations: For scientific and technologic inves- tigations concerning the mining, preparation, treatment, and utiliza- tion of ores and mineral substances, other than fuels, with a view to improving health conditions and increasing safety, efficiency, and economy in the mining, quarrying, metallurgical, and other mineral industries; including all equipment, supplies, expenses of travel, pur- chase (not to exceed three), operation, maintenance, and repair of motor-propelled passenger-carrying vehicles, and not to exceed $34,000 for personal services in the District of Columbia, $559,350: Provided, That no part of this appropriation may be expended for an investigation in behalf of any private party. Investigation and development of domestic mineral deposits, except fuels: For all expenses necessary to enable the Bureau of Mines to investigate, develop, and experimentally mine, on public lands and with the consent of the owner on private lands, deposits of minerals in the United States and its possessions, including surface and sub- surface explorations, laboratory tests, the construction, maintenance, and repair of necessary camp buildings, mining structures and appur- tenances, the lease of lands or buildings; purchase (not to exceed five), operation, maintenance, and repair of passenger automobiles; and not to exceed $45,000 for personal services in the District of Columbia; $1,700,000: Provided, That said Director, for the purposes of this appropriation, is authorized to accept lands, buildings, equipment, and other contributions from public or private sources and to prosecute projects in cooperation with other agencies, Federal, State, or private. Coal investigations: For all expenses necessary to enable the Bureau of Mines to investigate known coal deposits in the United States and its possessions; purchase (not to exceed two), operation, mainte- nance, and repair of passenger automobiles; purchase of books of reference and periodicals; purchase of special wearing apparel and equipment for the protection of employees while engaged in their work, and other items otherwise properly chargeable to the appropria- tion, "Contingent expenses, Department of the Interior"; and not to exceed $21,000 for personal services in the District of Columbia; $350,000: Provided, That the Director of the Bureau of Mines is authorized to carry on such investigations in cooperation with other agencies, Federal, State, or private: Provided further, That the said Director is hereby authorized and directed to make suitable arrange- ments with owners of private property upon which exploration or development work is performed for payment by such owners of a reasonable percentage, as determined by the Secretary of the Interior, of the total value of the minerals thereafter produced from such property. Oil and gas investigations: For inquiries and investigations and dissemination of information concerning the mining, preparation, treatment, and utilization of petroleum and natural gas, and for every other expense incident thereto, including purchase, not to exceed three, maintenance, operation, and repair of motor-propelled passenger- carrying vehicles; purchase, in the District of Columbia and elsewhere of other items otherwise properly chargeable to the appropriation 373 Pooling of equip- ment. Restriction. Acceptance oflands, etc. Investigations. Payment by owner of private property.