National changes in spatial-visual ability from 1960 to 1980
By: Thomas L. Hilton
Series: Research report -- 85-27; Research report (Educational Testing Service) -- RR-85-27
Publisher: Educational Testing Service
Published: 1985
Place of publication: Princeton, N.J
Language: eng
Number of pages: 17
Subjects: Educational tests and measurements
Notes: Includes bibliographical references (p. 16-17).