Dance and Dancers was a magazine about ballet.
 The magazine was founded in 1950 by publisher Philip Dosse and editor Peter Williams.
 John Percival edited the magazine from 1951 to 1995.
Peter Williams (22 April 188430 August 1976) was a rugby union player who represented New Zealand nine times, including a single Test match.
 He played club rugby for Dunedin side Alhambra, and played provincial rugby for Otago between 1908 and 1914.
 His sole season of international rugby was 1913, when he played in a home Test against Australia before touring North America with the All Blacksas New Zealand's international team is knownthat same year.
 He was selected for a tour of Australia the following year, but was unavailable and so did not play.
Rivista Italiana Difesa ("RID"; meaning "Italian Defence Magazine" in English) is an Italian military magazine published by Coop Giornalistica La Riviera, from Chiavari (Liguria).
 Founded in 1982, has recently reached 25 years of activity with a silver cover.
 The magazine is published eleven times a year.
 The field of interests are about military and geostrategical analysis.
 Many articles were published with over 10 pages length, among them many aircraft designs analysis (such as MiG-31 in April 1992, Tu-22M in 1995, Su-24 in October 1996, AMX in 1993 and 1998, C-27J in April 2000).
 The magazine's former director was Giovanni Lazzari; the present director is Pietro Batacchi.
ARCHIVE Global is an international non-profit organization that focuses on the link between health and housing.
 ARCHIVE stands for Architecture for Health In Vulnerable Environments.
 ARCHIVE Global was founded by "Utne Reader" visionary Peter Williams in 2006.
 Initially started in the United States, the organization welcomed ARCHIVE UK, its first affiliate based in the United Kingdom in 2009.
 ARCHIVE currently has ongoing projects in Bangladesh, Cameroon, Haiti, and the UK.
 Projects implement design solutions in housing to combat diseases such as HIV/AIDS, Tuberculosis, Malaria, respiratory diseases, diarrheal diseases, and neglected tropical diseases.
 ARCHIVE Global is the winner of the 2013 Katerva Award for Urban Design, and was also named by "Forbes" magazine as one of the World's Best Sustainability ideas.
Freedom's Journal was the first African-American owned and operated newspaper published in the United States.
 Founded by Rev. Peter Williams, Jr. and other free black men in New York City, it was published weekly starting with the 16 March 1827 issue.
 "Freedom's Journal" was superseded in 1829 by "The Rights of All", published between 1829 and 1830 by Samuel Cornish, the former senior editor of the "Journal".
Peter Williams (born 29 September 1945 in Nottingham England) is a former motorcycle road racer who enjoyed success when competing at many levels on home short-circuits, International and Grand Prix races.
 He raced many times on the Isle of Man TT course from 1966 to 1973.
 His father was Jack Williams who ran the Associated Motor Cycles (AMC) race department.
 Peter trained in mechanical engineering and introduced via racing an innovation which is commonplace on today's road bikes, alloy wheels, and was an early pioneer of disc brakes.
 He raced in the era of Giacomo Agostini, Barry Sheene, Mick Grant, Percy Tait, Tony Jefferies, Paul Smart, Dave Potter and John Cooper.
The rook and bishop versus rook endgame is a chess endgame where one player has just a rook, bishop and king, and the other player has only a rook and king.
 It has been studied many times through the years.
 This combination of material is one of the most common pawnless chess endgames.
 It is generally a theoretical draw, but the rook and bishop have good winning chances in practice because the defense is difficult.
 Ulf Andersson won the position twice within a year, once against a grandmaster and once against a candidate grandmaster; and grandmaster Keith Arkell has won it 18 times out of 18 .
 In positions that have a forced win, up to 59 moves are required .
 Tony Kosten has seen the endgame many times in master games, with the stronger side almost always winning .
 Pal Benko called this the "headache ending" .
The Groove was an Australian R&B, pop group which formed in early 1967 with the lineup of Geoff Bridgford on drums, Jamie Byrne on bass guitar, Tweed Harris on keyboards, Rod Stone on guitar and Peter Williams on lead vocals and guitar.
 In December 1967 their single, "Simon Says", peaked at No. 17 on the "Go-Set" National Top 40 Singles Chart.
 They followed with "Soothe Me", which peaked at No. 14 in April 1968.
 Also in April they released their self-titled debut album.
 In July that year they won the national final of the Hoadley's Battle of the Sounds competition with the prize including a trip to London.
 They relocated there in March 1969, and early the following year they changed their name to Eureka Stockade, they disbanded in 1971.
 On 13 October 2004 Tweed Harris died of throat cancer, aged 63.
The Cut is a bi-monthly New Zealand golf magazine.
 It has become a multiple award winner since launching in August 1999 and focuses on golf features, news and columns along with lifestyle content such as fashion, travel and motoring.
 Recent changes have included the introduction of a challenging new tuition package.
 Writers include experienced broadcasters Peter Williams and Brendon Telfer, Tiger Woods’ Kiwi caddie Steve Williams and award-winning journalist Marc Hinton.
Utne Reader (a.k.a. Utne) is a quarterly American magazine that collects and reprints articles on politics, culture, and the environment, generally from alternative media sources including journals, newsletters, weeklies, zines, music, and DVDs.

Question: How many times a year is Peter Williams' magazine published?
Answer: quarterly