The Miami who remained in Indiana now identify as the Miami Nation of Indiana, but lack federal recognition as such. The use of the Miami-Illinois language declined precipitously after the migration to Oklahoma because of the concentration of various tribes, each with a different native language, in a single relatively small area (now Ottawa County, Oklahoma). English served naturally as the lingua franca of the Quapaw Agency, and minority languages soon underwent attrition. Nonetheless, the Miami-Illinois of this period has left valuable documentation due to the work of trained linguists and ethnographers in the area. Albert Gatschet recorded several examples of connected speech, including mythological narratives, and Truman Michelson elicited grammatical material and stories. These relatively long documents are valuable for reconstructing speech patterns in Miami-Illinois. Due to a comparative lack of contemporary interest in the language, it is difficult to identify the last native speakers of Miami-Illinois in either Indiana or Oklahoma, or the contexts in which the language last saw everyday use. The documentation of the 1950s and 1960s shows a language in the advanced stages of attrition, as seen in Herbert Bussard's notes on the speech of Ross Bundy (possibly the last speaker in Indiana). The grammatical complexity of Bundy's Miami was significantly reduced and analogised to English in comparison to "standard" (i.e. 19th-century and revitalised) Miami-Illinois. The language as a whole was moribund by the 1930s, and probably no longer natively spoken by the 1970s. The revitalization effort is based on the work of linguist David Costa. Based on his extensive studies, he published The Miami-Illinois Language in 1994 as his Ph.D. dissertation and as a book in 2003. The book reconstructs the structure of Miami-Illinois. Language revitalization Many Miami members have described the language as "sleeping" rather than "extinct" since it was not irretrievably lost. The Myaamia Center is a joint venture between the tribe and Miami University. The Center seeks to "deepen Myaamia connections through research, education, and outreach." It is directed by Daryl Baldwin, who taught himself Miami from historic documents and studies held by the Smithsonian's National Anthropological Archives, and has developed educational programs. Baldwin's children were raised as native speakers of Miami. Center staff develop language and culture resources using material that is often from translated missionary documents. Published language and culture resources include: a children's book of Miami language and culture; an audio CD set with vocabulary, phrases, conversation, and