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Zachariah Poulson, Jr., Philadelphia is mentioned in the "Immigration Index", Filby & Meyer; Pennsylvania, 1772 Record of Indentures, Pg 96. I believe he was a writer/publisher and also progenitor of his line in America.
Also mentioned in the Filby & Meyer source is Charles Poulson of Philadephia, 1860 in "U. S. Index of Aliens", Vol 4, Pg 81 and also mentions Gilbert Poulson, Philadelphia, 1866, Vol 4, Pg 28.