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[[preprinted]] 1950 THURSDAY 21 DECEMBER 355th Day Pilgrims Landed Plymouth Rock 1620 - St. Thomas 10 Days to come [[double line]] [[/preprinted]] At A1L - Mineola. Received copy 77 of RDB meeting. Deposited it in AIL files. Worked mainly on System Comparison scheme. Talked with Geo Valley.