The writing system known as Pollard Miao writing was devised in 1905 by Samuel Pollard, a British missionary, with help from Yang Yage and Li Shitifan. Before Pollard came along, the A-Hmao language, when written at all, was written with Chinese characters. Pollard Miao underwent many changes and revisions and didn't become stable until 1936, when a translation of the New Testament was published in Pollard Miao writing.
The authorities in Beijing were not too keen on a writing system invented by a foreign missionary and in 1957 they introduced an alternative system based on Hànyŭ Pīnyīn. This was not popular among the A-Hmao people, who were already familiar with the Pollard system.
Various efforts have been made to improve Pollard Miao writing, which inadequately represents the phonetics and tones of A-Hmao and is not ideal for writing Chinese loan words. A semi-official 'reformed' Pollard script has been in use since 1988, along with the older version of the script, and the pīnyīn version.
A-Hmao or Hwa Miao, a dialect of Miao spoken in Yúnnán province in the southwest of China. Outside China, Miao is known as Hmong and is spoken in Vietnam, Laos, Thailand and the USA. The approximate number of native speakers of Miao/Hmong is 5.5 million.
In Vietnam, Laos and Thailand, Hmong is written with either the Pahawh Hmong script or the Latin alphabet.
Songs and Stories and a Glossary of Phrases of the Hua Miao of South West China (includes free font): http://www.archives.ecs.soton.ac.uk/miao/
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