| Published: | 1995 |
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| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:24:31 |
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| Producer: | Alan Velecky |
| Contributors: | Evelyn Brown; Meg Huby; Avtar Marwaha |
| Publisher: | BBC Open University |
| Keyword(s): | Science |
| Production number: | FOUF446P |
| Videofinder number: | 4834 |
| Available to public: | no |
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