Question: In which year did Tom Gray aid in the discovery of a hominid fossil

full_context: Document 1: KNM ER 1805: KNM ER 1805 is the catalog number given to several pieces of a fossilized skull of the species "Homo habilis". It was discovered in Koobi Fora, Kenya in 1974. The designation indicates specimen 1805, collected from the east shore of Lake Rudolf (now Lake Turkana) for the Kenya National Museums.
Document 2: KNM ER 3883: KNM ER 3883 is the catalogue number of a fossilized skull (nearly complete cranium) of the species "Homo erectus". The fossil was discovered by Richard Leakey in 1976 in Koobi Fora, east of Lake Turkana (formerly lake Rudolf), Kenya.
Document 3: WLH-50: Fossil WLH-50 is a partial cranium fossil that was discovered in 1982, in the Willandra Lakes Region of Australia and was reconstructed by Alan Thorne. Speculation surrounds the exact age of this fossil hominid and a debate concerning its ancestry in relation to other late Pleistocene hominids, as well as, Ngandong hominids due to their close resemblance to one another.
Document 4: Amos Gray: Amos N. Gray was a Liberian trade unionist. Born on 3 March 1933 in Pull River, Maryland County, Gray attended primary school in Pull River and secondary school in Harper. He attended college in Monrovia, studying social studies for two years and law for one year. During his college years he worked part-time at the Freeport of Monrovia. Working at the port in 1960, he joined the Maritime and Dock Workers Union. After his college years he worked at the Maritime and Dock Workers Union office in Monrovia.
Document 5: Tom Gray (archaeologist): Tom Gray is an archaeologist that aided in the discovery of the hominid fossil Lucy, alongside Donald Johanson. During their expedition, Gray, then a graduate student, prompted Johanson to return to a previously explored dig site where Johanson then discovered the fossilized remains of Lucy.
Document 6: Kamoya Kimeu: Kamoya Kimeu, (born 1940) is one of the world's most successful fossil collectors who, together with paleontologists Meave Leakey and Richard Leakey, is responsible for some of the most significant paleoanthropological discoveries. Kimeu found a "Homo habilis" skull known as KNM ER 1813, an almost complete "Homo erectus" skeleton named KNM-WT 15000 or Turkana Boy (also known as Nariokotome boy), and in 1964 the jaw of a "Paranthropus boisei" skull known as the Peninj Mandible. He has two fossil primates named after him: "Kamoyapithecus hamiltoni" and "Cercopithecoides kimeui".
Document 7: KNM ER 3733: KNM ER 3733 is a fossilized hominid cranium of the extinct hominid "Homo ergaster", which is interchangeably referred to as "Homo erectus". It was discovered in 1975 in Koobi Fora, Kenya, right next to Lake Turkana, by Bernard Ngeneo, a field worker for Richard Leakey. Its geographic location is not to be confused with that of KNM WT 15000, Turkana Boy, also known as Nariokotome Boy, who was also found near Lake Turkana nine years later in 1984.
Document 8: Alex Gray (author): Alex Gray, born 27 May 1950, Glasgow, is a Scottish crime writer. She has published thirteen novels, all set around Glasgow and featuring the character of Detective Chief Inspector Lorimer and his psychological profiler Solomon Brightman, the earlier novels being published by Canongate and later books by Little Brown. She has also written several magazine articles.
Document 9: Lucy (Australopithecus): Lucy is the common name of AL 288-1, several hundred pieces of bone fossils representing 40 percent of the skeleton of a female of the hominin species "Australopithecus afarensis". In Ethiopia, the assembly is also known as Dinkinesh, which means "you are marvelous" in the Amharic language. Lucy was discovered in 1974 in Africa, near the village Hadar in the Awash Valley of the Afar Triangle in Ethiopia, by paleoanthropologist Donald Johanson of the Cleveland Museum of Natural History.
Document 10: Gen Suwa: Gen Suwa (born 1954) is a Japanese paleoanthropologist. He is known for his contributions to the understanding of the evolution of early hominids, including the discovery of a tooth from a hominid that was more than one million years older than the oldest previously known hominid. The discovery changed scientific opinion regarding the ancestral splits between humans, chimps and gorillas.
Document 11: Thomas Dale Stewart (anthropologist): Thomas Dale Stewart (June 10, 1901 – October 27, 1997) was a founder of modern forensic anthropology and a major contributor to most areas of human skeletal biology, paleopathology, and related areas of physical anthropology. Stewart was known to have a more even temperament than his mentor, Aleš Hrdlička. Stewart began his career in 1927 as an Aid to Hrdlička in the Division of Physical Anthropology of the United States National Museum at the Smithsonian Institution. He advanced to Curator of the Division in 1942 and to Head Curator of the Department of Anthropology in 1961. In 1963, he was appointed Director of the National Museum of Natural History and also served as Acting Assistant Secretary for Science in 1964. He retired from administration in 1966 to pursue his research as Senior Anthropologist. Upon his retirement in 1971, he was appointed Anthropologist Emeritus.
Document 12: KNM ER 406: KNM ER 406 is an almost complete fossilized skull of the species "Paranthropus boisei". It was discovered in Koobi Fora, Kenya by Richard Leakey and H. Mutua in 1969.
Document 13: K. Christopher Beard: K. Christopher Beard is an American paleontologist, a world-renowned expert on the primate fossil record and a 2000 MacArthur Fellowship “Genius” Award Winner. Beard's research is reshaping critical debates about the evolutionary origins of mammals, including primates, routinely questioning current thinking about their geographical origins. Dr. Beard is the former Curator of the Carnegie Museum of Natural History, and Mary R. Dawson Chair of Vertebrate Paleontology, at University of Pittsburgh. He is currently Distinguished Foundation Professor, Senior Curator at the University of Kansas. He was co-author with Dan Gebo about an extinct primate from China. Dr. Beard also authored the book The Hunt for the Dawn Monkey: Unearthing the Origins of Monkeys, Apes and Humans. Beard was also part of the research teams that discovered Teilhardina, the earliest primate ever found in North America, and Eosimias, one of the earliest higher primates yet discovered. He worked with NASA to scan a "Tyrannosaurus rex" skull. Beard received his PhD from the Functional Anatomy and Evolution Program at Johns Hopkins University School of Medicine in 1989.
Document 14: Zeresenay Alemseged: Zeresenay (Zeray) Alemseged (born 4 June 1969) is an Ethiopian paleoanthropologist and was Chair of the Anthropology Department at the California Academy of Sciences in San Francisco, United States. He recently joined the faculty of the University of Chicago. He is best known for his discovery, on December 10, 2000, of Selam, also referred to as “Lucy’s child”, the almost-complete fossilized remains of a 3.3 million year old child of the species "Australopithecus afarensis". The “world’s oldest child”, she is the most complete skeleton of a human ancestor discovered to date. Selam represents a milestone in our understanding of human and pre-human evolution and contributes significantly to our understanding of the biology and childhood of early species in the human lineage; a subject about which we have very little information. Alemseged discovered Selam while working with the Dikika Research Project (DRP), a multi-national research project, which he both initiated in 1999 and leads. The DRP has thus far made many important paleoanthropological discoveries and returns to the field each year to conduct further important research. Alemseged’s specific research centers on the discovery and interpretation of hominin fossil remains and their environments, with emphasis on fieldwork designed to acquire new data on early hominin skeletal biology, environmental context, and behavior.
Document 15: Michel Brunet (paleontologist): Michel Brunet (born on April 6, 1940) is a French paleontologist and a professor at the Collège de France. In 2001 Brunet announced the discovery in Central Africa of the skull and jaw remains of a late Miocene hominid nicknamed Toumaï. These remains are believed to predate the earliest previously known hominid remains, Lucy, by over three million years.
ground_truth: 1974