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100   $a20230509c2018uuuu  -u-            -
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200 00$aEnhancing school safety using a threat assessment model : an operational guide for preventing targeted school violence
210   $cU.S. Department of Homeland Security, United States Secret Service, National Threat Assessment Center$aWashington, D.C
517   $aEnhancing school safety using a threat assessment model 
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996   $aEnhancing school safety using a threat assessment model : an operational guide for preventing targeted school violence$93259141
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