A Things of Science unit from 1971 on plastics.
Here is the booklet from the module (cleaned up):
Things of Science (1971) — Plastics
More Things of Science scanned here.
A Things of Science unit from 1971 on plastics.
Here is the booklet from the module (cleaned up):
Things of Science (1971) — Plastics
More Things of Science scanned here.
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