The Hmong (pronounced "mong" in English) are a mountain-dwelling subgroup of the Miao of southwest China. In the 18th and 19th centuries, the Hmong began migrating southeast to Vietnam, Laos, and Thailand. Then in the second half of the 20th century, due mainly to their participation in the Second Indochina War (1954-1975), the Hmong began migrating to the West. Today, the Hmong are one of the fastest growing ethnic origin populations in the United States, growing from about 94,000 in the 1990 census to about 190,000 in the U.S. census bureau's 2005 American Community Survey. With this rapid expansion in the population, a substantially increased interest in Hmong-related written works, multimedia materials, and websites among students, scholars, service professionals, and the general public has arisen. To help meet that interest, author Mark E. Pfeifer has compiled Hmong-Related Works 1996-2006: An Annotated Bibliography, which includes full reference information (including internet links to articles where available) and descriptive summaries for 610 Hmong-related works.