_Roads to Discovery_, Ralph E. Lapp, Harper and Row, Publishers, New York, 1960, 191 pp., out of print. Grades 10-12. Historical survey of nuclear physics beginning with Roentgen’s discovery of X rays and concluding with the discoveries of the rare elements. _Secret of the Mysterious Rays: The Discovery of Nuclear Energy_, Vivian Grey, Basic Books, Inc., Publishers, New York, 1966, 120 pp., $3.95. Grades 4-8. This outstanding history of nuclear research from Roentgen to Fermi is dramatically presented. The uncertainty of the unknown, the accidental discovery and the often lengthy and tedious research are woven in this story of scientists from around the world who pooled their knowledge and experience to unlock “the secrets of the mysterious rays”. _Wilhelm Roentgen and the Discovery of X Rays_, Bern Dibner, Franklin Watts, Inc., New York, 1968, 149 pp., $2.95. Grades 5-8. This detailed biography, illustrated with line drawings, historical photographs, and papers, is a fine addition to Watts’ “Immortals of Science” Series. _Working with Atoms_, Otto R. Frisch, Basic Books, Inc., New York, 1965, 96 pp., $4.95. Grades 9-12. Dr. Frisch presents a history of nuclear energy research and provides experiments for the reader. He gives a personal account of the pioneering work in which he and Lise Meitner explained the splitting of uranium and introduced the term “nuclear fission”. Advanced Books _An American Genius: The Life of Ernest Orlando Lawrence_, Herbert Childs, E. P. Dutton and Company, Inc., New York, 1968, 576 pp., $12.95. This well-written, scientifically accurate, and very interesting biography captures the excitement of Lawrence’s life. Ernest Lawrence was the inventor of the cyclotron, a major member of the wartime atomic energy development, and the director of the Lawrence Radiation Laboratory. _The Atom and Its Nucleus_, George Gamow, Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1961, 153 pp., $1.25. A popular-level discussion of nuclear structure and the applications of nuclear energy. _Atomic Energy for Military Purposes_, Henry D. Smyth, Princeton University Press, Princeton, New Jersey, 1945, 308 pp., $4.00. A complete account of the wartime project that developed the first nuclear weapons and of the considerations that prompted their use. _Atomic Quest_, Arthur H. Compton, Oxford University Press, Inc., New York, 1956, 370 pp., $7.95. A personal narrative of the research that led to the release of atomic energy on a useful scale by a scientist who played a principal part in the atomic bomb project during World War II.