1971

Urgent repairs
Urgent repairs (ca. 1971)
What to do when you discover an unexploded bomb
What to do when you discover an unexploded bomb (ca. 1971)
Self assistance and mutual assistance for personnel (one)
Self assistance and mutual assistance for personnel (one) (ca. 1971)
Self assistance and mutual assistance for personnel (two)
Self assistance and mutual assistance for personnel (two) (ca. 1971)
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