sentences:  The National Museum of the American Indian, as a part of the Smithsonian Institution, provided photographs of Yup'ik ceremonial masks colledted by Adams Hollis Twitchell, an explorer and trader who traveled Alaska during the Nome Gold Rush newly arrived in the Kuskokwim region, in Bethel in the early 1900s.Yup'ik dancing ("yuraq" in Yup'ik) is a traditional Eskimo style dancing form usually performed to songs in Yup'ik.Round drums cover with seal stomach and played with wooden sticks of driftwood provide a rhythmic beat.