The modern children's library of knowledge.
Wolff, Leslie.World of nature.
Moore, W. G.(Wilfred George),1907-World we live in.
McNicol, Harry.World of the past.
Nunn, Gordon.World of science and invention.
Walker, Ralph S.World of arts and pastimes.
Blyton, Enid.School companion.
Bk. 1. The world of nature / by Leslie Wolff, Geoffrey Spencer -- bk. 2. The world we live in / by W.G. Moore, Walter Shepherd, Peter Hood -- bk. 3. The world of the past / by Harry McNicol, F.H.M. Meade, Arnold W. Zimmermann -- bk. 4. The world of science and invention / by Gordon Nunn -- bk. 5. The world of arts and pastimes / by Ralph S. Walker [and five others] -- bk. 6. The school companion / by Enid Blyton [and five others].