These results were then aggregated to give a Top 12 chart (with 15 entries due to tied positions) that was published in "NME" on 14 November 1952. Other periodicals produced their own charts and The Official Charts Company and Guinness' British Hit Singles & Albums regard "NME" as the canonical British singles chart until 10 March 1960. After this "Record Retailer" is regarded as the canonical source until February 1969, when the British Market Research Bureau (BMRB) was formed. However, during the 1960s "NME" had the biggest circulation of charts in the decade and was the most widely followed. After 1969, "NME" continued to compile charts in the 1970s and 1980s and ended its time as the longest running independently compiled in May 1988. "Record Mirror" compiled its own record chart from 1955 until 1962 which was used by many national newspapers. It formed as the first rival to the existing chart published by "NME". The "Mirror"s chart was based on the postal returns from record stores that were financed by the newspaper—rival chart, "NME", was based on a telephone poll. Its first chart was a Top 10 published on 22 January 1955 using figures from 24 shops. The chart was expanded from a Top 10 to a Top 20 on 8 October 1955. In the early 1960s some national newspapers switched to using a chart compiled by "Melody Maker" and, ultimately, the cost of collecting sales figures by post led to the chart's demise. On 24 March 1962, the paper stopped compiling its own chart and started publishing "Record Retailer"s Top 50. "Melody Maker" compiled its own chart from 1956 until 1988 which was used by many national newspapers. It was the third periodical to compile a chart and rivaled existing compilers "NME" and "Record Mirror". "Melody Maker"s chart, like "NME"s, was based on a telephone poll of record stores. "Melody Maker" compiled a Top 20 for its first chart using figures from 19 shops on 7 April 1956. During the 1950s, sample sizes ranged from around 14–33 shops and on 30 July 1960 the phoning of record shops was supplemented with postal returns; the first chart to use this method sampled 38 stores from 110 returns. On 26 August 1967, "Disc", owned by the same company as "Melody Maker", stopped compiling their own chart and started using the "Melody Maker" chart. In its 9 February 1963 edition, "Melody Maker" disclosed that it received chart returns from 245 retailers and that its chart was audited by auditors supplied by Middlesex County Council.