Powers, Samuel Ralph; Neuner, Elsie Flint; Brunes, Herbert Bascom; and Bradley, John Hodgdon. Adverturing in Science series: I. Exploring Our World. 522 p. $1.44. II. Our World Changes. 585 p. $1.68. III. Using Our World. 666 p. $2.16. Our World and science. 684 p. $2.20. Directing Activities: I. 120 p. $0.64; II. 166 p. $0.68; III. and Teachers' Manual for each are available. Boston: Ginn and Company, 1946