Things of Science unit from July, 1961. Unfortunately the booklet was not in pristine shape. The front page of the booklet looked literally moth eaten. Nonetheless, I scanned it and tried to clean it up as best I could.

Interesting bit of material science here. Some history, chemistry, and a bunch of rubber samples to test.

Here is the booklet:

Things of Science #249 — Synthetic Rubber

More Things of Science scanned here.

The things: