film, video cassettes, DVDs, compact discs, video discs, CD-ROMs, and other pre-recorded optical, electronic, and magnetic media all featuring geography, science, natural science, nature, wildlife, ecology, social studies, history, natural history, archaeology, astronomy, geology, anthropology, zoology, botany, and environmental topics

'anthropolog':39 'archaeolog':36 'astronomi':37 'botani':41 'cassett':3 'cd':10 'cd-rom':9 'compact':5 'disc':6,8 'dvds':4 'ecolog':30 'electron':18 'environment':43 'featur':23 'film':1 'geographi':24 'geolog':38 'histori':33,35 'magnet':20 'media':21 'natur':26,28,34 'optic':17 'pre':15 'pre-record':14 'record':16 'rom':11 'scienc':25,27 'social':31 'studi':32 'topic':44 'video':2,7 'wildlif':29 'zoolog':40

NATIONAL GEOGRAPHIC DIGITAL MOTION

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