Energy: The Solar Prospect, by Denis Hayes. (Worldwatch Paper 11.) Worldwatch Institute, 1776 Massachusetts Avenue NW, Washington, D.C. 20036: 79 pp., 21.7 × 14 × 0.5 cm, paper cover, US $2, 1977.Redefining National Security, by Lester R. Brown. (Worldwatch Paper 14.) Worldwatch Institute, 1776 Massachusetts Avenue NW, Washington, D.C. 20036: 46 pp., figs, 21.5 × 14 × 0.4 cm, paper cover, US $2, 1977.Energy for Development: Third World Options, by Denis Hayes. (Worldwatch Paper 15.) Worldwatch Institute, 1776 Massachusetts Avenue NW, Washington, D.C. 20036: 43 pp., 21.5 × 14 × 0.3 cm, paper cover, US $2, 1977.