Tigao jingti hanwei lingkong. Zhanbei jiaoyu guatu zhisan
'Heighten our vigilance to protect our national airspace. Third battle preparedness education poster'.
| Institution: | International Institute of Social History |
|---|---|
| Format: | IMAGE |
| Published: |
1962, June
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10622/C8481235-F9AA-4EEE-80C2-22816DA6D131 |