Question: What part of the Assabet River National Wildlife Refuge was formerly used as a dumping ground by the Natick Laboratories until the 1980s?

Context paragraphs:
Yukon Flats National Wildlife Refuge: The Yukon Flats National Wildlife Refuge is a protected wetland area in the U.S. state of Alaska.  It encompasses most of the Yukon Flats, a vast wetland area centered on the confluence of the Yukon River, Porcupine River, and Chandalar River.  The area is a major waterfowl breeding ground, and after a proposal to flood the Yukon Flats via a dam on the Yukon River was turned down, the Yukon Flats were deemed worthy of protection.  The Alaska National Interest Lands Conservation Act established the refuge in 1980.  It is the third-largest National Wildlife Refuge in the United States, although it is less than one-half the size of either of the two largest, the Arctic National Wildlife Refuge, or the Yukon Delta National Wildlife Refuge.  The refuge is administered from offices in Fairbanks.

Desert National Wildlife Refuge: The Desert National Wildlife Refuge is a protected wildlife refuge, administered by the U.S. Fish and Wildlife Service, located north of Las Vegas, Nevada, in northwestern Clark and southwestern Lincoln counties, with much of its land area lying within the southeastern section of the Nevada Test and Training Range.  The Desert NWR, created on May 20, 1936, is the largest wildlife refuge in the lower 48 states of the United States, encompassing 1.615 e6acre of the Mojave Desert in the southern part of Nevada.  This Range is part of the larger Desert National Wildlife Refuge Complex, which includes the Ash Meadows National Wildlife Refuge, the Moapa Valley National Wildlife Refuge, and the Pahranagat National Wildlife Refuge.

Featherstone National Wildlife Refuge: The Featherstone National Wildlife Refuge is a National Wildlife Refuge located along the Potomac River in Virginia, at the point where it meets Neabsco Creek.  The 325 acre of tidal marsh has been administered by the United States Fish and Wildlife Service since 1970; currently, it is part of the Potomac River National Wildlife Refuge Complex.  The refuge covers wetlands and woodlands, and has a railroad right-of-way bordering its western edge.  It is currently closed to the public, but has been considered as a possible portion of the route for the Potomac Heritage National Scenic Trail.

Pahranagat National Wildlife Refuge: The Pahranagat National Wildlife Refuge is a protected wildlife refuge, located at the southern end of the Pahranagat Valley and administered by the U.S. Fish and Wildlife Service.  It is situated 90 mi north of Las Vegas, Nevada in Lincoln County, Nevada.  The 5380 acre refuge was created on August 16, 1963 and is part of the larger Desert National Wildlife Refuge Complex, which also includes the Ash Meadows National Wildlife Refuge, the Desert National Wildlife Refuge, and the Moapa Valley National Wildlife Refuge.

Nantucket National Wildlife Refuge: Nantucket National Wildlife Refuge is a 24 acre range and was established in 1973 for its "particular value in carrying out the national migratory bird management program."  The refuge, which is cooperatively managed with The Trustees of Reservations, encompasses 24 acre at Great Point.  Nantucket National Wildlife Refuge is an un-staffed unit of the Eastern Massachusetts National Wildlife Refuge Complex.  Nantucket National Wildlife Refuge consists of the Northeast tip of Nantucket, known as Great Point.  The Refuge has been managed informally by TTOR several decades.  TTOR owns the land immediately adjacent to Great Point, known as the Coskata-Coatue Wildlife Refuge.  Great Point is known as one of the best surfcasting locations in New England because of the rip tide which brings bluefish and striped bass to the point.  The Refuge is also a destination for hundreds of visitors each year seeking to enjoy a Nantucket beach or a tour of the Great Point Lighthouse.  More information about the adjacent TTOR property is available on their website.

Assabet River National Wildlife Refuge: Assabet River National Wildlife Refuge, (formerly referred to as the U.S. Army's Fort Devens-Sudbury Training Annex), is a 2230 acre protected National Wildlife Refuge located approximately 25 mi west of Boston, and 4 mi west of the Eastern Massachusetts National Wildlife Refuge Complex Headquarters, along the Assabet River.  It is located in portions of the Towns of Hudson, Maynard, Stow and Sudbury.  The Assabet River National Wildlife Refuge consists of two separate pieces of land.  The larger northern section is just north of Hudson Road, extending north to the Assabet River.  The southern section is located to the south of Hudson Road.  There is a visitor center located in the northern section, on Winterberry Way.

Fort Devens-Sudbury Training Annex: The Fort Devens-Sudbury Training Annex was a former annex of Fort Devens that was operational from 1942 to the 1990s.  It originally opened as an ammunition dump for the base, and old railroad lines and bunkers can still be seen in the area.  It then functioned as a dumping ground for the Natick Laboratories until the 1980s.  In the 1990s, the site was cleaned up and turned into the Assabet River National Wildlife Refuge.

Occoquan Bay National Wildlife Refuge: The Occoquan Bay National Wildlife Refuge is a National Wildlife Refuge located where the Occoquan River meets the Potomac River in Woodbridge, Virginia, United States.  The 644 acre site, about half of which is wetlands, was a popular tourist spot known as Dawson Beach until the 1940s, after which it was used for military research by the U.S. Army's Harry Diamond Laboratories from the 1960s to the 1990s.  When the land was purchased from the military, it was temporarily called the Marumsco National Wildlife Refuge.  The refuge was formally established and renamed in 1998, and is now managed by the United States Fish and Wildlife Service as part of the Potomac River National Wildlife Refuge Complex.

White River National Wildlife Refuge: The White River National Wildlife Refuge (officially Dale Bumpers White River National Wildlife Refuge) is a 160756 acre wildlife refuge located in Desha, Monroe, Phillips, and Arkansas counties in the U.S. state of Arkansas.  The refuge is managed by the United States Fish and Wildlife Service.  White River NWR borders on Cache River National Wildlife Refuge at its northern boundary.

Pasila dumping ground: The Pasila dumping ground was a dumping ground in Ilmala, Helsinki between 1949 and 1963.  It was the main dumping ground of the city at the time, one of the “big three”.  The other two were the Iso-Huopalahti dumping ground and the Vuosaari dumping ground.  It was located at the present site of the Ilmala Railyard.  Before 1949 it was the main dumping ground of the Finnish State Railways.  Technically the site is part of the Pasila neighbourhood.

Supporting paragraphs: Assabet River National Wildlife Refuge Fort Devens-Sudbury Training Annex
Answer: Fort Devens-Sudbury Training Annex