Submission of bids.

(a) A separate sealed bid shall be submitted for each tract in the manner prescribed. A bid shall not be submitted for less than an entire tract. (b) Each bidder shall submit with the bid a certified or cashier's check, bank draft, U.S. currency or any other form of payment approved by the Secretary for one-fifth of the amount of the cash bonus, unless stated otherwise in the notice of sale. (c) Each bid shall be accompanied by statements of qualifications prepared in accordance with § 3132.4 of this title. (d) Bidders are bound by the provisions of 18 U.S.C. 1860 prohibiting unlawful combination or intimidation of bidders.