Pre-recorded cd-roms containing information used to teach and explain the concepts and ideas students need to complete lessons in connection with scholastic subjects such as reading, writing, math, history, social studies, geography and science, and other subjects on the K-12 grade level; pre-recorded cd-roms containing educational content on subjects such as reading, writing, math, history, social studies, geography and science, and other subjects on the K-12 grade level

'-12':45,76 'cd':5,52 'cd-rom':4,51 'complet':21 'concept':15 'connect':24 'contain':7,54 'content':56 'educ':55 'explain':13 'geographi':36,67 'grade':46,77 'histori':33,64 'idea':17 'inform':8 'k':44,75 'lesson':22 'level':47,78 'math':32,63 'need':19 'pre':2,49 'pre-record':1,48 'read':30,61 'record':3,50 'rom':6,53 'scholast':26 'scienc':38,69 'social':34,65 'student':18 'studi':35,66 'subject':27,41,58,72 'teach':11 'use':9 'write':31,62

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