[5] S.McCormick (ed.),The ASTC Science Center Survey:education report,Washington,DC:ASTC,1988;M.St.John and S.Grinell,Highlights of the 1987 ASTC Science Center Survey:an independent review of findings,Washington,DC:ASTC,1989;S.McCormick,op.cit.,p.11.
[6] S.McCormick (ed.),The ASTC Science Center Survey:education report,Washington,DC:ASTC,1988;M.St.John and S.Grinell,Highlights of the 1987 ASTC Science Center Survey:an independent review of findings,Washington,DC:ASTC,1989,pp.12-13.
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