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to the date or dates of delivery of the bonds, at the expense of the District. At the time or times of payment for and delivery of said bonds, the District will furnish the success­ful bidder a certificate that there is no litigation pending affecting the validity of said bonds. The bidder may attach such*terms and conditions to his bid or proposal as he may see fit, and the Board of Directors of the District will consider not only the price offered but also the various terms and conditions submitted in any proposal. The Board will award the bonds to such bidder or bidders as may submit the proposal or proposals deemed most advantageous to the District. The Board of Directors reserves the right to reject any or all bid3 or proposals or to the extent permitted by law to waive any irregularity or informality in any bid or proposal. The bids will be opened at the meeting of the Board of Directors to be held April 28, 1954, at 10:00 o'clock A.M., Pacific Standard Time, at the office of the District, 135 South Fourth Street, Las Vegas, Nevada. Bidders are invited to be present at the opening of the bids or proposals. Each bid or proposal must be firm for a period of time specified therein, not less than 48 hours after the expiration of the time for the receipt of bids and proposals as herein specified, and shall be subject to acceptance within that period; provided that such 17.