Introduction to homeland security 
David H. McElreath & et.al. 
 - Third edition. 
 -  CRC Press.  2021 
 - xvii, 472 pages 
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<br/><br/><label>ISBN: </label>978-1-03201111-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Civil defence.
<br/><br/><label>Dewey Class. No.: </label>353.30973 I61962 2021