Downes, Leonard William. The teaching of arithmetic in tropical primary schools / Leonard William Downes and D. Paling. - London : Oxford University Press, c 1963. - 500 p. : ill. ; 22 cm. - UNESCO handbooks on the teaching of science in tropical countries 5. . Includes index. Being volume 5 of the Unesco handbooks. 318 318 Subjects--Topical Terms: Elementary education--Mathematics. Dewey Class. No.: 372.7 / D785t