(a) Eligible regional corporations may select the maximum acreage granted pursuant to section 12(c) of the Act. They will be notified by the Secretary of their entitlement as expeditiously as possible.

(b) Where subsurface rights are not available to the eligible regional corporations in lands whose surface has been conveyed under section 14 of the Act, the regional corporations may select an equal subsurface acreage from lands withdrawn under sections 11(a) (1) and (3) of the Act, within the region, if possible.

(c) As appropriate, the regional corporations will receive title to the subsurface estate of lands, the surface estate of which is conveyed pursuant to section 14 of the Act.

(d) If a 13th regional corporation is organized under section 7(c) of the Act, it will not be entitled to any grant of lands.