Question: In what city is this museum located that is a natural history museum, one of the largest such museums in the world, and for which Louis Otho Williams worked?

Context paragraphs:
Beijing Museum of Natural History: The Beijing Museum of Natural History (BMNH; ) is located at 126 Tian Qiao Nan Street, Dongcheng District, Beijing, 100050, and is the most popular natural history museum in China.  It was founded in 1951 as the National Central Museum of Natural History, and its name was changed to the "Beijing Museum of Natural History" in 1962.  The BMNH is the first large scale natural history museum created in China.

Mongolian Natural History Museum: The Mongolian Natural History Museum (Mongolian: Байгалийн түүхийн музей ) is a repository and research institution located in Ulaanbaatar, Mongolia.  The museum was previously known as the Mongolian National Museum or State Central Museum.  This change in name has often led to confusion with Ulaanbaatar's other preeminent museum, the National Museum of Mongolia.  Although the two museums are located quite close to one another, they contain very different exhibits.  The Mongolian National Museum focuses on the archaeology and history of Mongolia, while the Mongolian Natural History Museum is concerned primarily with the flora, fauna, geology and natural history of the country.

Sam Noble Oklahoma Museum of Natural History: The Sam Noble Oklahoma Museum of Natural History is a natural history museum located on the campus of the University of Oklahoma.  The museum was founded in 1899 by an act of the Oklahoma Territorial Legislature, and opened its doors on its current location in 1999.  The museum contains approximately "7 million objects and specimens in 12 collections."  It has almost 50000 sqft of exhibit space, with five galleries and exhibits that provide an in-depth tour of Oklahoma’s natural history.  It is "one of the world's largest university-based natural history museums."

Louis Otho Williams: Louis Otho (Otto) Williams (1908-1991) was a botanist from Wyoming.  He received his BA and MA from the University of Wyoming then a PhD from Washington University in St. Louis.  He went on to be editor of the "American Orchid Society Bulletin" and during the war worked in Brazil on the rubber procurement project.  For much of the 1950s he lived in Honduras and started the journal "Ceiba" there.  After returning to the US he worked for the Field Museum of Natural History starting in 1960 and from 1964 to 1973 served as departmental chair.

List of Directors of the Natural History Museum: The Director of the Natural History Museum is the senior manager of the Natural History Museum, London, which was split off from the British Museum in 1881.  It should not be confused with the role of Director of Science, Natural History Museum.  The following list gives the first Superintendent and then the Directors of the Natural History Museum, London.

Croatian Natural History Museum: The Croatian Natural History Museum (Croatian: "Hrvatski prirodoslovni muzej" ) is the oldest and biggest natural history museum and the main body for natural history research, preservation and collection in Croatia.  Located on Dimitrije Demeter Street in Gornji Grad, one of the oldest neighbourhoods of the Croatian capital Zagreb, it owns one of the biggest museum collections in Croatia, with over 2 million artefacts, including over 1.1 million animal specimens.  It was founded in 1846 as the "National Museum".  The National Museum was later split up into five museums, three of which were in 1986 merged as departments of the newly named Croatian Natural History Museum.  The museum contains a large scientific library open to the public, and publishes the first Croatian natural history scientific journal, "Natura Croatica".

Natural History Museum, London: The Natural History Museum in London is a museum of natural history that exhibits a vast range of specimens from various segments of natural history.  It is one of three major museums on Exhibition Road in South Kensington, the others being the Science Museum and the Victoria and Albert Museum.  The Natural History Museum's main frontage, however, is on Cromwell Road.

Natural history museum: A natural history museum or museum of natural history is a scientific institution with natural history collections that include current and historical records of animals, plants, fungi, ecosystems, geology, paleontology, climatology, and more.  The primary role of a natural history museum is to provide the scientific community with current and historical specimens for their research, which is to improve our understanding of the natural world.  Some museums have public exhibits to share the beauty and wonder of the natural world with the public; these are referred to as 'public museums'.  Some museums feature non-natural history collections in addition to their primary collections, such as ones related to history, art, and science.

Field Museum of Natural History: The Field Museum of Natural History, also known as The Field Museum, is a natural history museum in Chicago, and is one of the largest such museums in the world.  The museum maintains its status as a premier natural history museum through the size and quality of its educational and scientific programs, as well as due to its extensive scientific specimen and artifact collections.  The diverse, high quality permanent exhibitions, which attract up to two million visitors annually, range from the earliest fossils to past and current cultures from around the world to interactive programming demonstrating today's urgent conservation needs.

Pterostylis caulescens: Pterostylis caulescens is a plant in the orchid family Orchidaceae and is endemic to New Guinea.  It was first formally described in 1946 by Louis Otho Williams from a specimen collected in the Rawlinson Range by Mary Strong Clemens.  The description was published in the Harvard University Botanical Museum Leaflets.  Williams noted that it was distinguished from other "Pterostylis" in New Guinea by its large stem leaves which are 55-75 mm long and 14-18 mm wide.  He also noted that he was describing the plant from poor material but that the colour of the flower was "flesh pink".  The specific epithet ("caulescens") is derived from the Latin word "caulis" meaning "a stem", hence caulescent.

Supporting paragraphs: Louis Otho Williams Field Museum of Natural History
Answer: Chicago