printed educational material, namely, teacher guidebooks and student guidebooks on the the subject of science for high school science students

'educ':2 'guidebook':6,9 'high':17 'materi':3 'name':4 'print':1 'school':18 'scienc':15,19 'student':8,20 'subject':13 'teacher':5

series of pre-recorded educational laser discs and video cassettes on the subject of science for high school science students

'cassett':11 'disc':8 'educ':6 'high':18 'laser':7 'pre':4 'pre-record':3 'record':5 'school':19 'scienc':16,20 'seri':1 'student':21 'subject':14 'video':10

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