Question: Which library is operated by the society that also operates a museum which became a National Historic Landmark in 1962?

Context paragraphs:
Harry S. Truman Historic District: The Harry S. Truman Historic District is a National Historic Landmark District encompassing sites closely associated with US President Harry S. Truman in Independence, Missouri.  It includes the Truman Home at 219 North Delaware, Truman's home for much of his adult life and now a centerpiece of the Harry S. Truman National Historic Site, and the Truman Presidential Library.  The district was listed on the National Register of Historic Places in 1971, and was designated a National Historic Landmark in 1974.  When first listed, the district included only the two buildings and a corridor joining them.  It was substantially enlarged in 2011 to include more sites and the environment in which Truman operated while living in Independence.

San Juan Bautista State Historic Park: San Juan Bautista Plaza Historic District, also known as San Juan Bautista State Historic Park is a historic district in San Juan Bautista, California, United States, that is a National Historic Landmark and a California state historic park.  It includes the Mission San Juan Bautista, the Jose Castro House (another National Historic Landmark), and several other buildings.  It became a State Park in 1933 and was declared a National Historic Landmark in 1970.

Oliver H. Kelley Homestead: The Oliver H. Kelley Farm is a historic farmstead in Elk River, Minnesota.  It was once owned by Oliver Hudson Kelley, one of the founders of the Order of Patrons of Husbandry.  The farmstead is a U.S. National Historic Landmark, which also places it on the National Register of Historic Places.  The farm is currently operated as a living history museum by the Minnesota Historical Society.  It was declared a National Historic Landmark in 1964.

Wadsworth-Longfellow House: The Wadsworth-Longfellow House is a historic house and museum in Portland, Maine, United States.  It is located at 489 Congress Street and is operated by the Maine Historical Society.  It was designated a National Historic Landmark in 1962, and administratively added to the National Register of Historic Places in 1966.  The house is open daily to public from May through October (half days on Sundays).  An admission fee is charged.

Mercer Museum: The Mercer Museum is a museum located in Doylestown, Pennsylvania, United States.  The Bucks County Historical Society operates the Mercer Museum, as well as the Research Library, and Fonthill Castle, former home of the museum's founder, archeologist Henry Chapman Mercer.  The museum was individually listed on the National Register of Historic Places in 1972, and was later included in a National Historic Landmark District along with the Moravian Pottery and Tile Works and Fonthill.  These three structures are the only poured-in-place concrete structures built by Mercer.

Maggie L. Walker National Historic Site: The Maggie L. Walker National Historic Site is a United States National Historic Landmark and a National Historic Site located at 110½ E. Leigh Street on "Quality Row" in the Jackson Ward neighborhood of Richmond, Virginia.  The site was designated a U.S. National Historic Landmark in 1975.  The National Historic Site was established in 1978 to tell the story of the life and work of Maggie L. Walker (1867-1934), the first woman to serve as president of a bank in the United States.  It was built by George W. Boyd, father of physician, Sarah Garland Boyd Jones.  The historic site protects the restored and originally furnished home of Walker.  Tours of the home are offered by National Park Service rangers.

Maine Historical Society: The Maine Historical Society is the official state historical society of Maine.  It is located at 489 Congress Street in downtown Portland.  The Society currently operates the Wadsworth-Longfellow House, a National Historic Landmark, Longfellow Garden, the Maine Historical Society Museum and Store, the Brown Research Library, as well as the Maine Memory Network, an online database of documents and images that includes resources from many of state's local historical societies.

Guthrie Historic District (Guthrie, Oklahoma): The Guthrie Historic District (GHD) is a National Historic Landmark District encompassing the commercial core of Guthrie, Oklahoma, US.  According to its National Historic Landmark Nomination it is roughly bounded by Oklahoma Avenue on the north, Broad Street on the east, Harrison Avenue on the south, and the railroad tracks on the west; it also includes 301 W. Harrison Avenue.  The National Historic Landmarks Program on-line document describes the boundaries as "14th Street, College Avenue, Pine Street and Lincoln Avenue.  One building, the Logan County Courthouse, is at 301 E. Harrison Avenue, outside the main boundaries of the GHD," This article relies on the former source, which is more detailed.  According to the 1998 nomination, the proposed district covered 31 acres .  The nomination included 112 resources, classed as 69 contributing buildings, 38 non-contributing buildings, 1 non-contributing structure and 3 noncontributing objects.  It was declared a National Historic Landmark in 1999 for its historic significance as the first capital of the Oklahoma Territory and of Oklahoma.

Powder Magazine (Charleston, South Carolina): The Powder Magazine is a gunpowder magazine and museum at 79 Cumberland Street in Charleston, South Carolina, USA.  Completed in 1713, it is the oldest surviving public building in the former Province of Carolina.  It was used as a gunpowder store through the American Revolutionary War, and later saw other uses.  The Powder Magazine was declared a National Historic Landmark in 1989.  It has been operated as a museum by the National Society of the Colonial Dames of America since the early 1900s.  it was designated a National Historic Landmark in 1972.

Essex Institute Historic District: The Essex Institute Historic District is a historic district at 134-132, 128, 126 Essex Street and 13 Washington Square West in Salem, Massachusetts.  It consists of a compact group of properties associated with the Essex Institute, founded in 1848 and merged in 1992 into the Peabody Essex Museum.  Listed by increasing street number, they are: the Crowninshield-Bentley House, the Gardner-Pingree House (a National Historic Landmark), the John Tucker Daland House, and the Phillips Library (the latter two are physically connected).  The John Ward House, which fronts on Brown Street but shares the 132 Essex Street address, is another National Historic Landmark within the district.  The Andrew Safford House at 13 Washington Square West, built in 1819, was said to be the most expensive home in New England at the time.

Supporting paragraphs: Maine Historical Society Wadsworth-Longfellow House
Answer: Brown Research Library