PUBLIC LAWS-CH. 395-JUNE 18, 1940 Federal aid to States. 60 Stat. 917. 16 U. . C., Supp. V, If 609-060. Proviso. Limitation on ex- penditures. Personal services. Vehicles for field. Proviso.. Maintenance of ve- hicles, purchase of books, etc. Expenses of attend- ance at meetings. Interchange of amounts. Exchange of vehi- cles, etc. Cooperative work by Bureau 41 Stat. 270. Slarie. Propagation of food oWbas. the unobligated balance on June 30, 1940, of the total of the proceeds received from the sale of stamps prior to July 1, 1940. FEDERAL AID IN WIDLIFE RESTORATION For carrying out the provisions of the Act entitled "An Act to provide that the United States shall aid the States in wildlife restora- tion projects, and for other purposes", approved September 2, 1937 (16 U. S . C . 669-669j), $2,500,000: Provided, That expenditures here- under shall not exceed the aggregate receipts covered into the Treasury under the provisions of said Act. Total, Bureau of Biological Survey, $5,141,093 and in addition thereto funds made available under the Migratory Bird Conserva- tion Fund of which amounts not to exceed $709,940 may be expended for personal services in the District of Columbia, and not to exceed $76,600 shall be available for the purchase of motor-propelled pas- senger-carrying vehicles necessary in the conduct of field work out- side the District of Columbia: Provided, That funds available for the work of the Bureau of Biological Survey shall be available for the maintenance, repair, and operation of motor-propelled passenger- carrying vehicles; the purchase of books, periodicals, and newspapers (not to exceed $100); for the expenditure from appropriations avail- able for the purchase of lands of not to exceed $1 for each option to purchase any particular tract or tracts of land; for necessary expenses (not exceeding $5,000) of attendance at meetings of societies or associations concerned with the work of the Bureau of Biological Survey; for expenses of packing and transportation of household effects (not exceeding five thousand pounds in any one instance) of employees when transferred, for the good of the service, from one official station to another for permanent duty, when specifically authorized in the order directing the transfer; and for the employ- ment, by contract or otherwise, of men with equipment, boats, work animals, animal-drawn and motor-propelled vehicles: Provided fur- ther, That not to exceed 5 per centum of the foregoing amounts for the miscellaneous expenses of the work of the Bureau of Biological Survey herein provided for shall be available interchangeably for expenditure on the objects included within the general expenses of said Bureau, but no more than 5 per centum shall be added to any one item or appropriation: Provided further, That the Bureau of Biological Survey may exchange motor-propelled and horse-drawn vehicles, tractors road equipment, boats, typewriters, computing or duplicating machines, or parts, accessories, tires, or equipment thereof, in part payment for vehicles, tractors, road equipment, boats, typewriters, computing or duplicating machines, or parts, accessories, tires, or equipment thereof: Provided further, Tat cooperative work conducted by the Bureau of Biological Survey shall continue to be subject to the provisions of the Act of July 24, 1919 (5 U. S . C . 563-564). BUREAU OF FISHERIES Salaries: For the Commissioner and other personal services in the District of Columbia, $172,300, of which amount not to exceed $5,320 may be expended for personal service in connection with the mainte- nance and operation of aquarium. Propagation of food fishes: For maintenance, repair, alteration, improvement, equipment, acquisition, and operation of fish-cultural stations, general propagation of food fishes and their distribution, including movement, maintenance, and repairs of cars and not to exceed $15,000 for purchase of trucks for fish distribution; mainte- nance, repair, and operation of motor-propelled passenger-carrying 454 [54 STAT.