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[[envelope]] [[preprinted]] SMITHSONIAN INSTITUTION WASHINGTON 25, D. C. OFFICIAL BUSINESS PENALTY FOR PRIVATE USE TO AVOID PAYMENT OF POSTAGE $300 (P M G C) [[/preprinted]] [[circular postal cancellation stamp]] WASHINGTON, D. C. NOV 30 7-PM 1951 [[/circular postal cancellation stamp]] [[stamped cancellation mark]] SAVE THE EASY WAY BUY U.S. BONDS ON PAYROLL SAVINGS [[/stamped cancellation mark]] [[clear address window]] ^[[11]]