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Changes in science performance, 1969-73 :
exercise volume : appendix /
National Assessment of Educational Progress.

APA Citation

National Assessment of Educational Progress (Project)., National Center for Education Statistics. (1977). Changes in science performance, 1969-73: exercise volume : appendix. Washington: Dept. of Health, Education, and Welfare, Education Division, National Center for Education Statistics : for sale by the Supt. of Docs., U.S. Govt. Print. Off..

MLA Citation

National Assessment of Educational Progress (Project), and National Center for Education Statistics. Changes In Science Performance, 1969-73: Exercise Volume : Appendix. Washington: Dept. of Health, Education, and Welfare, Education Division, National Center for Education Statistics : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1977.

Warning: These citations may not always be complete (especially for serials).