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61
Physics [motion pictures] learning about electronic current; electrical circuits: you can do it.
Published 1990Electronic Resource -
62
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63
Human beings [motion pictures] the digestive systems; the work of the heart.
Published 1990Electronic Resource -
64
Biology [videorecording] protist: form, function and ecology bacteria.
Published 1990Visual Material -
65
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66
Ocen dynamics [videorecording] the works of the sea, the beach: a river of sands waves on water.
Published 1990Visual Material -
67
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68
Learning about nuclear energy, electronics and work energy from the sun [videorecording].
Published 1990Visual Material -
69
Physics [videorecording] learning about electric current, electrical circuit you can do it.
Published 1990Visual Material -
70