Cassettes, compact discs, video discs, DVDs, CD-ROMs, audio cassettes, and audio tapes featuring music and narration; pre-recorded video cassettes, compact discs, video discs, DVDs, CD-ROMs, audio cassettes, and audio tapes featuring geography, science, natural science, nature, wildlife, ecology, social studies, history, natural history, archaeology, astronomy, geology, anthropology, zoology, botany, and environmental topics; software programs in the nature of interactive games; computerized video tabletop games and computer-based electronic learning aids containing both hardware and educational software

'aid':77 'anthropolog':53 'archaeolog':50 'astronomi':51 'audio':10,13,32,35 'base':74 'botani':55 'cassett':1,11,23,33 'cd':8,30 'cd-rom':7,29 'compact':2,24 'comput':73 'computer':67 'computer-bas':72 'contain':78 'disc':3,5,25,27 'dvds':6,28 'ecolog':44 'educ':82 'electron':75 'environment':57 'featur':15,37 'game':66,70 'geographi':38 'geolog':52 'hardwar':80 'histori':47,49 'interact':65 'learn':76 'music':16 'narrat':18 'natur':40,42,48,63 'pre':20 'pre-record':19 'program':60 'record':21 'rom':9,31 'scienc':39,41 'social':45 'softwar':59,83 'studi':46 'tabletop':69 'tape':14,36 'topic':58 'video':4,22,26,68 'wildlif':43 'zoolog':54

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