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v. 1: The how and why wonder book of dinosaurs, by Darlene Geis. -- v. 2: The how and why wonder book of weather, by George Bonsall. -- v. 3: The how and why wonder book of electricity, by Jerome J. Notkin and Sidney Gulkin. -- v. 4: The how and why wonder book of rocks and minerals. -- v. 5: The how and why wonder book of rockets and missiles. -- v. 7: The how and why wonder book of insects, by Ronald N. Rood. -- v. 8: The how and why wonder book of reptiles and , by Robert Mathewson. -- v. 9: The how and why wonder book of birds, by Robert Mathewson. -- v. 10: The how and why wonder book of our earch, by Felix Sutton. -- v. 11: The how and why wonder book of beginning scienec, by Jerome J. Notkin and Sidney Gulkin. -- v. 12: The how and why wonder book of machines, by Jerome J. Notkin and Sidney Gulkin. -- v. 13: The how and why wonder book of the human body, by Martin Keen. -- v. 14: The how and why wonder book of sea shells, by Donald F. Low. -- v. 15: The how and why wonder book of atomic energy, by Donald Barr. -- v. 16: The how and why wonder book of the microscope and what you see, by Martin Keen. -- v. 17: The how and why wonder book of the civil war. -- v. 18: The how and why wonder book of mathematics. -- v. 20: The how and why wonder book of ballet. -- v. 21: The how and why wonder book of chemistry, by Martin L. Keen. -- v. 22: The how and why wonder book of horses, by Margaret Cabell Self. -- v. 23: The how and why wonder book of expolrations and discoveries. -- v. 24: The how and why wonder book of primitive man, by Donald Barr. -- v. 25: The how and why wonder book of north America, by Irving Robbin. -- v. 26: The how and why wonder book of planets and interplanetary travel. -- v. 27: The how and why wonder book of wild animals. -- v. 28: The how and why wonder book of sound. -- v. 29: The how and why wonder book of lost cities. -- v. 30: The how and why wonder book of ants and bees, by Ronald N. Rood. -- v. 31: The how and why wonder book of wild flowers, by Grace F. Ferguson. -- v. 32: The how and why wonder book of dogs, by Irving Robbin. -- v. 33: The how and why wonder book of prehistoric mammals, by Martin L. Keen. -- v. 34: The how and why wonder book of science experiments, by Martin L. Keen. -- v. 35: The how and why wonder book of world war II, by Felix Sutton. -- v. 36: The how and why wonder book of Florence Nightingale, by Robert N. Webb. -- v. 37: The how and why wonder book of butterflies and . -- v. 39: The how and why wonder book of robots and electronic brains, by Robert Scharff. -- v. 40: The how and why wonder book of light and color, by Harold Joseph Highland. -- v. 41: The how and why wonder book of the west, by Felix Sutton. -- v. 42: The how and why wonder book of the American revolution, by Felix Sutton. -- v. 43: The how and why wonder book of caves to skyscrapers, by Irving Robbin. -- v. 45: The how and why wonder book of time, by Gene Liberty. -- v. 46: The how and why wonder book of magnets and magnetism, by Martin L. Keen. -- v. 47: The how and why wonder book of guns, by Irving Robbin. -- v. 49: The how and why wonder book of famous scientists. -- v. 50: The how and why wonder book of the old test , by Gilbert Klaperman. -- v. 51: The how and why wonder book of building, by Donald Barr. -- v. 53: The how and why wonder book of trees by Geoffrey Coe. -- v. 54: The how and why wonder book of Oceanography, by Robert Scharff. -- v. 55: The how and why wonder book of north American indians, by Felix Sutton. -- v. 56: The how and why wonder book of mushroom, ferns and mosses. -- v. 57: The how and why wonder book of the polar regions. -- v. 58: The how and why wonder book of coins and currency, by Paul J. Gelinas. -- v. 59: The how and why wonder book of basic inventions, by Irving Robbin. -- v. 60: The how and why wonder book of the first world war. -- v. 61: The how and why wonder book of electronics, by Martin L. Keen. -- v. 62: The how and why wonder book of desert. -- v. 63: The how and why wonder book of air and water. -- v. 64: The how and why wonder book of stars, by Norman Hoss. -- v. 65: The how and why wonder book of airplanes and the story of flight. -- v. 66: The how and why wonder book of fish. -- v. 67: The how and why wonder book of boats and ships. -- v. 68: The how and why wonder book of the moon. -- v. 69:The how and why wonder book of trains and railroads.
