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City Auditor - Archives & Records Management - City Collections - Civil Defense (Archival) - Civil Defense Records - Civil Defense Subject Files - Attack Warning System : Details of tower for air raid siren |
M/1682 |
08/31/1952 |
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City Auditor - Archives & Records Management - City Collections - Civil Defense (Archival) - Civil Defense Records - Civil Defense Subject Files - Attack Warning System : Portland Map tentative location for sirens |
M/1637 |
12/31/1952 |
