Ahtna and Southern Tutchone songs, stories, and interviews. The majority of this collection consists of Ahtna songs and stories recorded by Frederica de Laguna in 1968. Most were recorded at Copper Center, with additional ones also recorded at Cantwell, Chistochina, Gulkana, and Tetlin. Includes dance songs, sorry songs, potlatch songs, sleep doctor songs, and others. Includes "Gulkana Potlatch Given by Bill Joe and Kate Sanford for Recovery of Maggie Joe from Illness." Some songs are Tlingit, Upper Tanana, or Tanacross in origin. Also includes Ahtna stories, autobiographical accounts, vocabularies, and interviews. There are also some Southern Tutchone songs recorded at Burwash Landing, Yukon Territory. Formerly titled "Materials Recorded at Copper Center, Alaska."

The Mary Rosamond Haas papers are extensive, including correspondence, research notes, field notes, texts, lexical slip files, audio recordings, photographs, reprints and more, covering more than 100 languages of North America and Southeast Asia. Of particular value are notes and audio recordings from fieldwork from the 1930s on Ditidaht, Tunica, Natchez and Muscogee, work toward pedagogical materials for Thai, and groundbreaking comparative studies of several language families of North America.