Samuel Adams and his Committees of Correspondence?

Desperately searching for the date of which Samuel Adams 'urged' the towns in Massachusetts to establish committees of correspondence. I know the year, however my sources vary: 1772 or 1773? And the month of when he urged the towns?

I've searched up, down, and around. My sources: Google, multiple websites FROM Google, My History Text Book. It's just the month that's always missing!
Any information from Wikipedia, in my eyes, is invalid. So please have a reasonable source!
 
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