The solar alternative : an economic perspective / A.L. Walton, and E.H. Warren, Jr. Walton, A. L. (Amy L.) Warren, E. H. (Eugene H.) Solar energy Economic aspects. Energy policy. 333.7923 WAS Includes bibliographical references and index. Englewood Cliffs, N.J. : Prentice-Hall, 1982. 1982. 1982 Text xiv, 173 p. : eng