Advances in Optical Masers, A. L. Schawlow, _Scientific American_, 209: 34 (July 1963). The Evolution of the Physicist’s Picture of Matter, P. A. M. Dirac, _Scientific American_, 208: 45 (May 1963). Filling in the Blanks in the Laser’s Spectrum, F. M. Johnson, _Electronics_, 39: 82 (April 18, 1966). The Amateur Scientist—How a persevering amateur can build a gas laser in the home, C. L. Stong, _Scientific American_, 211: 227 (September 1964). The Amateur Scientist—Homemade Laser, C. L. Stong, _Scientific American_, 213: 108 (December 1965). The Amateur Scientist—How to make holograms and experiment with them or with ready-made holograms, C. L. Stong, _Scientific American_, 216: 122 (February 1967). The Maser, James P. Gordon, _Scientific American_, 199: 42 (December 1958). The Quantum Theory: Early Years to 1923, Karl Darrow, _Scientific American_, 186: 47 (March 1952). Laser’s Bright Magic, T. Meloy, _National Geographic Magazine_, 130: 858 (December 1966). Infrared and Optical Masers (original paper), A. L. Schawlow and C. H. Townes, _Physical Review_, 112: 1940 (December 15, 1958). Laser Market Enters Era of Practicality, W. Mathews, _Electronic News_, 11: 1 (April 18, 1966). Lasers, A. K. Levine, _American Scientist_, 51: 14 (March 1963). Lasers, A. L. Schawlow, _Science_, 149: 13 (July 2, 1965). Lasers and Coherent Light, A. L. Schawlow, _Physics Today_, 17: 28 (January 1964). The Laser’s Dazzling Future, L. Lessing, _Fortune_, 67: 138 (June 1963). Optical Masers, A. L. Schawlow, _Scientific American_, 204: 52 (June 1961). Optical Pumping, A. L. Bloom, _Scientific American_, 202: 72 (October 1960). Research on Maser-Laser Principle Wins Nobel Prize in Physics, J. P. Gordon, _Science_, 146: 897 (November 13, 1964). Resource Letter MOP-1 on Masers (Microwave through Optical) and on Optical Pumping, H. W. Moos, _American Journal of Physics_, 32: 589 (August 1964), extensive bibliography. Available from American Institute of Physics, 335 East 45th Street, New York 10017. Enclose stamped return envelope. Advances in Holography, K. S. Pennington, _Scientific American_, 218: 40 (February 1968). Applications of Laser Light, D. R. Herriott, _Scientific American_, 219: 140 (September 1968). Holography for the Sophomore Laboratory, R. H. Webb, _American Journal of Physics_, 36: 62 (January 1968). Laser Light, A. L. Schawlow, _Scientific American_, 219: 120 (September 1968). The Modulation of Laser Light, D. F. Nelson, _Scientific American_, 218: 17 (June 1968). Articles—Special Subjects