Ruth Clark (Woodcraft name: Minobi, meaning Glad Heart) (29 November 1899 – 2 October 1964) was the author of the first woodcraft book for girls and an active original member of the Kibbo Kift.
Clark was a member of the Camp Fire Girls movement as a girl. She was the leader of The Merrie Campers group of woodcraft girls. She was a co-founder of the Kibbo Kift and incorporated her girls into it, but was not involved in the Green Shirt Movement for Social Credit.
Clark was born in Sunderland. She married John Hargrave on 28 November 1919. They had one son, Ivan Gordon Hargrave (1920–1992). Clark and Hargrave "parted company" in the early 1930s and were divorced in the 1950s. She died in Scarborough in 1964.
- Matthew De Abaitua (7 July 2011). The Art of Camping: The History and Practice of Sleeping Under the Stars. Penguin Books Limited. pp. 120–. ISBN 978-0-14-196895-7.
- Designing Utopia: John Hargrave and the Kibbo Kift. Museum of London. 2015. ISBN 978-1-78130-040-4.
- "Who were the Kibbo Kift?". Archived from the original on 2016-06-10. Retrieved 2007-12-29.
- Godfrey, Monica (2003). The World of Elsie Jeanette Oxenham and Her Books. Girls Gone By Publishers. p. 59. ISBN 1904417159.
- Books to Read. Hesperides. p. 200. ISBN 1-4067-5565-6.
- The book "OM KA" written by John Hargrave on his marriage (Museum of London)
- Who was who: A Companion to Who's Who, Containing the Biographies of Those who Died, Volume 8 A. & C. Black, 1981
- "Descendants of James Clark". Archived from the original on 2007-08-14. Retrieved 2007-12-29.