The works of J. R. R. Tolkien have generated a body of research covering many aspects of his fantasy writings. These encompass The Lord of the Rings and The Silmarillion, along with his legendarium that remained unpublished until after his death, and his constructed languages, especially the Elvish languages Quenya and Sindarin. Scholars from different disciplines have examined the linguistic and literary origins of Middle-earth, and have explored many aspects of his writings from Christianity to feminism and race. Biographical Biographies of Tolkien have been written by Humphrey Carpenter, with his 1977 J. R. R. Tolkien: A Biography and of Tolkien's wartime years by John Garth with his 2003 Tolkien and the Great War: The Threshold of Middle-earth. Carpenter edited the 1981 The Letters of J. R. R. Tolkien, assisted by Christopher Tolkien. The brief period after the war when Tolkien worked for the OED is detailed in the 2006 book The Ring of Words: Tolkien and the Oxford English Dictionary by Peter Gilliver, Jeremy Marshall and Edmund Weiner. On Tolkien's writings Institutions A variety of institutions have developed to support Tolkien research. These include The Tolkien Society and The Mythopoeic Society. Tolkien archives are held in the Bodleian Library in Oxford and Marquette University in Milwaukee, Wisconsin. Publishers of scholarly books on Tolkien include Houghton Mifflin, McFarland Press, Mythopoeic Press, Walking Tree Publishers, Palgrave MacMillan, and Kent State University Press. Journals Early publications on Tolkien's writing were essentially fanzines; some, such as Mythlore, founded in 1969, developed into scholarly peer-reviewed (refereed) technical publications; among the "reputable" journals is Mallorn by the Tolkien Society. Other specialised journals include Tolkien Studies (2004–) and Journal of Tolkien Research (2014–). There are several journals that focus on the literary society The Inklings, of which Tolkien was a member, especially Journal of Inklings Studies (2011–). Conferences In 1992, the Mythopoeic Society held a conference for the centenary of Tolkien's birth, combining papers that were published in the conference proceedings, with a mixed programme of events over a period of eight days, 17–24 August 1992, in Oxford. Omentielva is a European bi-yearly conference on research into Tolkien's invented languages. Fields A large literature examines Tolkien's Middle-earth fantasy fiction from numerous points of view, including medievalism, its philological roots in languages such as Old Norse and Old English, its influences from literature of different periods, its poetry, its Christian symbolism, feminism, race, sexuality, and many other