00907cam a2200265 4500 hew68000126 DLC 20260227111517.0 690307s1968 dcua 00000 eng c hew68000126 //r85 U.S. Dept. of Health, Education and Welfare. Library L112.A71358 n-us--- L112 .A48 370/.78/4 United States. Office of Education. Bureau of Research. Research and development: advances in education. Washington, For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1968. 107 p. illus. 24 cm. 1.50 "OE 12034." Educational innovations United States. Education Research United States. Educational innovations United States. Educational research United States. 34805 34805