The Secretary is authorized to designate those auction markets where tobacco bought and sold thereon at auction, or the products customarily manufactured therefrom, moves in commerce. Before any market is designated by the Secretary under this section he shall determine by referendum the desire of tobacco growers who sold tobacco at auction on such market during the preceding marketing season. The Secretary may at his discretion hold one referendum for two or more markets or for all markets in a type area. No market or group of markets shall be designated by the Secretary unless two-thirds of the growers voting favor it. The Secretary shall have access to the tobacco records of the Collector of Internal Revenue and of the several collectors of internal revenue for the purpose of obtaining the names and addresses of growers who sold tobacco on any auction market, and the Secretary shall determine from said records the eligibility of such grower to vote in such referendum, and no grower shall be eligible to vote in more than one referendum. After public notice of not less than thirty days that any auction market has been so designated by the Secretary, no tobacco shall be offered for sale at auction on such market until it shall have been inspected and certified by an authorized representative of the Secretary according to the standards established under this chapter, except that the Secretary may temporarily suspend the requirement of inspection and certification at any designated market whenever he finds it impracticable to provide for such inspection and certification because competent inspectors are not obtainable or because the quantity of tobacco available for inspection is insufficient to justify the cost of such service: Provided, That, in the event competent inspectors are not available, or for other reasons, the Secretary is unable to provide for such inspection and certification at all auction markets within a type area, he shall first designate those auction markets where the greatest number of growers may be served with the facilities available to him. The Secretary shall by regulation fix and collect fees and charges for inspection and certification, the establishment of standards, and other services under this section at designated auction markets. The fees and charges