Deskribapena
Alearen deskribapena:"University of Wisconsin--Madison."
Prepared with funding from the National Institute of Edcuation, U.S. Department of Education, under contract no. NIE-C-400-76-0122"--P. ii.
"ED205776."
"CE029788."
Deskribapen fisikoa:xi, 36 p. ; 28 cm.
Bibliografia:Includes bibliographies.