Both documents approve the same police contract instrument (June 2010–May 2012); Document B is the adopted/final form clarifying the contract term after Document A's initial approval.
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These other documents cite or incorporate this one:
Two separate contract approvals 182 days apart; the 2010 document approves an initial contract and the 2011 document approves a revised version, making them distinct board actions on successive iterations rather than a single document revision.