1) Oceanography - 1964, Hardcover
2) Electricity - 1960, Softcover
3) Stamps - 1970, Softcover
4) The Moon - 1963, Softcover
5) The Human Body - 1961, Softcover
6) The Tower of London - 1970, Softcover
7) Fish - 1963, Hardcover
8) Horses - 1961, Softcover
9) Our Earth - 1960, Hardcover