For the purpose of coordinating its activities with the needs and undertakings of other local organizations and groups, the board of directors may establish an advisory board consisting of the chairman of the board of directors of the agency (who shall be chairman of the advisory board), and of sufficient members to represent adequately so far as possible industry, commerce, agriculture, the general public, any official planning and developmental bodies in the locality and organized citizens groups working for the development of the Elk River area.