Gordon, Kenneth F; Gordon, Kenneth F; Hahn, Walter A. (1973). Assessing the future and policy planning /editors Walter A. Hahn and Kenneth F. Gordon. : Gordon And Breach Science Publishers,.
Gordon, Kenneth F; Gordon, Kenneth F; Hahn, Walter A. Assessing the future and policy planning /editors Walter A. Hahn and Kenneth F. Gordon. : Gordon And Breach Science Publishers,, 1973
Gordon, Kenneth F; Gordon, Kenneth F; Hahn, Walter A. Assessing the future and policy planning /editors Walter A. Hahn and Kenneth F. Gordon. : Gordon And Breach Science Publishers,, 1973.