 The Helmerich Center for American Research at Gilcrease Museum was added in 2014 at a cost of $14 million to provide a secure archival area where researchers can access any of the more than 100,000 books, documents, maps and unpublished materials that have been acquired by the museum.Thomas Gilcrease grew up in the Creek Nation, located within present day Oklahoma.At the turn of the 20th century the federal government distributed lands held by American Indian tribes to private citizens.