From the USC Digital Archives:
“Photographer: Glickman. Date: 1958-03-26. Assignment: Saticoy School evacuation plan, 7850 Ethel Avenue, Van Nuys. G119-20: Children evacuate class rooms in predetermined plan for disaster”.
Saticoy School Evacuation: 1958
Here in Van Nuys 
I remember this sort of thing.
I was at Anatola Elementary starting in 1959.
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