Question: What is the book that the author of Ug is best known for?

full_context: Document 1: Ethel &amp; Ernest: Ethel & Ernest (subtitled "A True Story") is a graphic novel and animated film by English author and illustrator Raymond Briggs. It tells the story of the lives of Briggs' parents from their first meeting in 1928 to their deaths in 1971.
Document 2: Frank Cottrell-Boyce: Cottrell-Boyce has won two major British awards for children's books, the 2004 Carnegie Medal for "Millions", which originated as a film script, and the 2012 Guardian Prize for "The Unforgotten Coat", which was commissioned by a charity.
Document 3: The Snowman: The Snowman is a children's picture book without words by English author Raymond Briggs, first published in 1978 by Hamish Hamilton in the United Kingdom, and published by Random House in the United States in November of the same year. In the UK, it was the runner up for the Kate Greenaway Medal from the Library Association, recognising the year's best children's book illustration by a British writer.
Document 4: John Coates (producer): John Coates (7 November 1927 – 16 September 2012) was a British film producer, best known for producing the animated film "The Snowman" based on the picture book by Raymond Briggs, one of the first animated productions screened on Channel Four and still repeated every year on the channel.
Document 5: How to Be a Little Sod: How To Be A Little Sod, was written in 1991 by author Simon Brett to show what a baby may think during his/her first year of development. The format is in a traditional diary style, listing selected days and events. The main character's name is never actually revealed in the story, the child is always referred to as 'baby.' We also do not find out the gender at any time, so readers can make up their own minds on these missing details. The book is written in the first person, referring as 'I' and shows the baby through their first year of life. The other characters include the mother, referred to as 'Her' and the father, known as 'Him.' There are also the two sets of grandparents, whose awkward get-togethers leave a chill in the air. The book covers a range of traditional development techniques, including the advancement to solid foods, learning to crawl and saying the first word. However, the book is not intended to be a parents guide. It is a fictional book which uses realistic elements.
Document 6: Elementary Safety Book: Elementary Safety (The Elementary Safety Book for Children) is an English-language magazine published annually by Regional Maple Leaf Communications Inc. It was first published in 1985 and is aimed at children between the ages of six and ten. It deals with all issues pertaining to children safety. The Elementary Safety Book for Children has been endorsed by RCMP Foundation since 1999 and was formerly illustrated by Ben Wicks from 1996 - 2000. After his death, RMC created "The Ben Wicks Award" in his honor and each year, up-and coming artists from Canada and the US entered the contest for a chance to win the right to illustrate the book and collect the $10,000 prize.
Document 7: Shadow (Marcia Brown book): Shadow is a children's picture book created by Marcia Brown and published by Scribner in 1982. The text is Brown's translation of the poem "La Féticheuse" by French writer Blaise Cendrars. She won the annual Caldecott Medal for illustration of an American children's picture book in 1983, her third.
Document 8: Allumette: A Fable: Allumette; A Fable, with Due Respect to Hans Christian Andersen, the Grimm Brothers, and the Honorable Ambrose Bierce, by Tomi Ungerer, was originally published in 1974. It is a "reimagining" of "The Little Match Girl" by Hans Christian Andersen. The book's extended title references Andersen, for "The Little Match Girl", as well as fairy tale authors the Brothers Grimm, and satirist Ambrose Bierce. The book was initially published in 1974, and carried in the United States by Parents' Magazine Press and Scholastic, both bargain retailers. It was also briefly reprinted in 1986, but has since gone out of print again.
Document 9: Father Christmas (1991 film): Father Christmas is a 1991 animated short based on two books written by Raymond Briggs: "Father Christmas" and "Father Christmas Goes on Holiday", published in 1973 and 1975 respectively. It was first aired in Britain in 1991 on Channel 4, nine years after "The Snowman", another animated Briggs adaptation produced for the same channel. This movie was dedicated to the late actor John McGuire. The film was first released on DVD in 2000, bundled with "The Snowman". It was later released separately.
Document 10: Simon Bartram: Simon Bartram is an English illustrator and writer of children's picture books. He was one runner-up for the Mother Goose Award in 1999 for "Pinocchio" and for the Kate Greenaway Medal in 2002 for "Man on the Moon: A Day in the Life of Bob". In 2004 "Man on the Moon" was voted "best illustrated book to read aloud" by a panel of "Blue Peter" viewers and also named Blue Peter Book Awards Book of the Year.
Document 11: Ug (book): Ug is a children's book by Raymond Briggs. In 2001 it won the Nestlé Smarties Book Prize Silver Award.
Document 12: The Man (comics): The Man is a graphic novella for children, written and illustrated by Raymond Briggs and published by Julia MacRae Books in 1992. It tells the humorous story of a boy, John, who is visited by the titular Man, a minuscule human (homunculus) who arrives in the boy's bedroom unclothed and hungry. After getting over his initial shock, the boy starts to take care of him. The story follows their relationship over the next few days between John and 'Man', with the Man showing himself to be demanding, bossy and messy, but nevertheless a bond forms between the pair. Their time together involves many funny and peculiar moments, such as an odd obsession with Frank Cooper's Oxford marmalade, using socks for jumpers, and a near-death collision with a marmalade jar.
Document 13: Fungus the Bogeyman: Fungus the Bogeyman (1977) is a children's picture book by British artist Raymond Briggs. It follows one day in the life of the title character, a working class Bogeyman with the mundane job of scaring human beings.The character and all related properties are now owned by Vivendi's Studiocanal.
Document 14: Father Christmas (comics): Father Christmas is a British children's picture book written and drawn by Raymond Briggs and published by Hamish Hamilton in 1973. Briggs won the annual Kate Greenaway Medal from the Library Association, recognising the year's best children's book illustration by a British subject. For the 50th anniversary of the Medal (1955–2005), a panel named it one of the top ten winning works, which composed the ballot for a public election of the nation's favourite.
Document 15: Raymond Briggs: Raymond Redvers Briggs, CBE (born 18 January 1934) is an English illustrator, cartoonist, graphic novelist and author who has achieved critical and popular success among adults and children. He is best known in Britain for his story "The Snowman", a book without words whose cartoon adaptation is televised and whose musical adaptation is staged every Christmas.
ground_truth: The Snowman