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- SZ - Zuckerman Archive
- SZ/OEMU - Ministry of Home Security, Oxford Extra-Mural Unit
- SZ/OEMU/39 - [OEMU. CDRC - Helmets]
- SZ/OEMU/39/1 - [OEMU. CDRC - Helmets. Reports]
SZ/OEMU/39/1/1 - Summary of penetration tests on protective helmets, March 1941
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SZ/OEMU/39/1/2 - Penetration tests on a fabric-loaded plastic helmet, October 1941
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SZ/OEMU/39/1/3 - Penetration tests on a leather protective helmet and three despatch riders' emergency crash helmets, December 1941
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SZ/OEMU/39/1/4 - Tests of further materials suggested as substitutes for sorbo rubber in crash helmets, October 1942
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