Copies of the plan or plans and amendments or revisions of a plan or plans prepared by a commission may be transmitted by the commission to the chief administrative officers, the legislative bodies, the planning commissions, boards or agencies of the counties and cities, within its area, and to regional or metropolitan planning commissions established for adjoining areas. A commission may make copies of its plan or plans or parts of plans available for general distribution or sale, and may advise and supply information, as far as available, to persons and organizations who may request such advice and information and who are concerned with the area’s development problems. It may also provide information to state and local agencies and to the public at large, in order to foster public awareness and understanding of the objectives of regional or metropolitan planning, and in order to stimulate public interest and participation in the orderly, integrated development of the area served by the commission.