A Things of Science unit from March, 1962 on geometry. They indicate it was a popular unit and, as of 1962, has been re-issued several times. The copyright on the front page indicates 1949, 1956 and 1962. (Note also that it is re-done again in the 1969.)
There are a few cards that came with the unit that were printed on a stiff card stock. Those are reproduced on the last few pages of the booklet below.
Here is the booklet:
Things of Science #257 — Geometric Models
More Things of Science scanned here.
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