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As Michael says, people collect them as souvenirs. Military and other government agencies also collect them to prevent accidents. Even to this day farmers in Europe plow up munitions and other trash from WW1 and WW2 regularly, mines, torpedoes and aircraft bombs are dredged up in fishing nets and when dredging rivers and harbours to deepen and widen shipping ...
In Gaza they use spent shells as flower pots.
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