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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 1, PART III, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>CONSISTENT WITH THE POLICIES OF MANY OTHER MUSEUMS, THE VALUE OF THE MUSEUM'S COLLECTIONS IS NOT REFLECTED IN THE STATEMENT OF FINANCIAL POSITION. PURCHASES OF ITEMS ARE EXPENSED IN THE YEAR THAT THE ITEMS ARE ACQUIRED. CONTRIBUTED COLLECTION ITEMS ARE NOT REFLECTED IN THE FINANCIAL STATEMENTS. PROCEEDS FROM DEACCESSIONS OR INSURANCE RECOVERIES ARE USED TO ACQUIRE OTHER ITEMS FOR COLLECTION. CONTRIBUTIONS FOR THE PURCHASE OF ITEMS FOR THE COLLECTION ARE CLASSIFIED AS TEMPORARILY RESTRICTED NET ASSETS UNTIL ACQUISITIONS ARE MADE. THE COST OF THESE ITEMS IS REPORTED AS A SEPARATE PROGRAM EXPENSE.</ExplanationTxt>
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        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 2, PART III, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S COLLECTIONS TRACE THE HISTORY OF THE MONTAUK LIGHTHOUSE AS WELL AS THE SURROUNDING AREAS OF MONTAUK, NY. THE MONTAUK HISTORICAL SOCIETY MAINTAINS AND HOLDS OPEN TO THE PUBLIC THESE IMPORTANT HISTORICAL STRUCTURES: THE LIGHTHOUSE TOWER (CIRCA 1796 AND RENOVATED 1860), KEEPER'S DWELLING (1860), AND OIL HOUSE (1860). ADDITIONALLY, SECOND HOUSE, BUILT 1797, IS THE OLDEST AND MOST HISTORIC BUILDING STILL STANDING IN MONTAUK. THE ORGANIZATION'S COLLECTIONS ALSO INCLUDE ARTIFACTS, MANUSCRIPTS, WORKS OF ART AND OTHER HISTORICAL RECORDS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 3, PART X</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION EVALUATES, ON AN ANNUAL BASIS, THE EFFECTS OF UNCERTAIN TAX POSITIONS ON ITS FINANCIAL STATEMENTS USING A THRESHOLD OF MORE LIKELY THAN NOT. AS OF DECEMBER 31, 2020, THE ORGANIZATION HAS NOT IDENTIFIED OR PROVIDED FOR ANY SUCH POSITIONS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990 - ORGANIZATION'S MISSION</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MISSION OF THE SOCIETY IS TO CELEBRATE AND PRESERVE THE HISTORY OF THE MONTAUK AREA OF LONG ISLAND THROUGH EDUCATION PROGRAMS, OPERATING MUSEUMS, MAINTAINING COLLECTIONS AND PROMOTING RHE PRESERVATION OF HISTORUC BUILDINGS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 2, PART III, LINE 4A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE LIGHTHOUSE MUSEUM: THE MONTAUK HISTORICAL SOCIETY OWNS AND MAINTAINS THE MONTAUK POINT LIGHTHOUSE MUSEUM. THE MONTAUK POINT LIGHTHOUSE HAS LONG BEEN FAMED AS THE SYMBOL OF LONG ISLAND AND ONE OF AMERICA'S OLDEST LIGHTHOUSES. AUTHORIZED IN 1792 BY THE SECOND CONGRESS UNDER PRESIDENT GEORGE WASHINGTON, IT WAS BUILT BY NEW YORK ARCHITECT, JOHN MCCOMB, IN 1796. ON MARCH 5, 2012, THE MONTAUK POINT LIGHTHOUSE WAS DESIGNATED A NATIONAL HISTORIC LANDMARK, JOINING THE RANKS OF FEWER THAN 2,500 PRESTIGIOUS SITES IN THE UNITED STATES THAT ARE DESIGNATED BY THE SECRETARY OF THE INTERIOR AS HAVING EXCEPTIONAL VALUE IN ILLUSTRATING AND INTERPRETING THE HERITAGE OF OUR NATION. THE LIGHTHOUSE TOWER AND MUSEUM ARE OPEN TO THE GENERAL PUBLIC AND TOURS ARE AVAILABLE FOR SCHOOLS AND OTHER GROUPS. EVENTS AND EXHIBITIONS ARE HELD THROUGHOUT THE YEAR ON THE LIGHTHOUSE GROUNDS. THE LIGHTHOUSE MUSEUM, WHICH IS LOCATED IN THE 1860 KEEPERS' HOUSE, DISPLAYS AN ASSORTMENT OF HISTORICAL DOCUMENTS AND PHOTOGRAPHS AND IS HOME TO SEVERAL UNIQUE COLLECTIONS. IN ADDITION TO THE HISTORIC BUILDINGS AND DWELLINGS, THE COLLECTION INCLUDES NAUTICAL INSTRUMENTS, SHIP MODELS, FURNITURE, AND WHALING INDUSTRY ARTIFACTS. THERE ARE EXHIBITS SHOWING THE HISTORY OF THE LIGHTHOUSE AND THE EROSION CONTROL EFFORTS THAT HAVE BEEN IMPLEMENTED OVER THE YEARS. THE LIGHTHOUSE MUSEUM'S COLLECTION FEATURES TWO EXCLUSIVE ORIGINAL DOCUMENTS. ONE OF THESE IS THE CONGRESSIONAL AUTHORIZATION TO CONSTRUCT A LIGHTHOUSE AT MONTAUK POINT AND IS SIGNED BY THEN SECRETARY OF STATE, THOMAS JEFFERSON. THE OTHER IS THE FEDERAL AUTHORIZATION TO PURCHASE THE LAND AT MONTAUK POINT FOR THE PURPOSE OF BUILDING A LIGHTHOUSE. THAT DOCUMENT IS SIGNED BY THEN PRESIDENT GEORGE WASHINGTON. THE SECOND HOUSE MUSEUM: SECOND HOUSE BUILT IN 1746, AND REBUILT IN 1797, WAS ORIGINALLY A CATTLE KEEPER DWELLING. IT IS LOCATED ON THE WESTERN EDGE OF MONTAUK. SECOND HOUSE WAS ONE OF THE ONLY THREE HOUSES THAT EXISTED IN MONTAUK IN THE LATE 18TH AND EARLY 19TH CENTURIES. IT IS THE OLDEST AND MOST HISTORIC BUILDING STILL STANDING IN MONTAUK. IT IS CURRENTLY OPERATED AS A MUSEUM BY THE MONTAUK HISTORICAL SOCIETY. THE MONTAUK INDIAN MUSEUM: THE MONTAUK INDIAN MUSEUM IS DEDICATED TO THE PRESERVATION AND PROMOTIONS OF THE HISTORY AND CULTURE OF THE MONTAUK INDIAN. THROUGH EXHIBITS, DEMONSTRATIONS, LECTURES, AND EVENTS, THE MUSEUM WILL BRING THE STORY OF THE ORIGINAL MONTAUK INHABITANTS TO THE PUBLIC. THE OCEANS INSTITUTE: THE OCEANS INSTITUTE IS A MUSEUM ON THE LIGHTHOUSE GROUNDS FOCUSING ON OCEANIC EDUCATION AND HEIGHTENING AWARENESS SURROUNDING THE OCEAN'S HEALTH.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE 990 SHALL BE REVIEWED BY THE PRESIDENT AND THEN PRESENTED TO ALL BOARD MEMBERS VIA E-MAIL OR BY PAPER COPY.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION ANUALLY ASKS THE BOARD MEMBERS TO DISCLOSE ANY POSSIBLE CONFLICTS OF INTEREST.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SALARIES OF THE OFFICERS, IF ANY, SHALL BE FIXED BY RESOLUTION OF THE BOARD OF DIRECTORS. IN ALL CASES, ANY SALARIES RECEIVED BY OFFICERS OF THIS ORGANIZATIOM SHALL BE REASONABLE. ALL OFFICER SALARIES SHALL BE APPROVED IN ADVANCE IN ACCORDANCE WITH THE ORGANIZATION'S CONFLICT OF INTEREST POLICY.</ExplanationTxt>
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        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON WRITTEN REQUEST.</ExplanationTxt>
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    </IRS990ScheduleO>
  </ReturnData>
</Return>
