Josiah E. Hickman cites Ethan Smith as evidence for the Book of Mormon.
Josiah E. Hickman, Science, Tradition and the Book of Mormon (Salt Lake City: General Board of M.I.A., 1937), 88–89
Strict Precautionary Measures of Sanitation-Dr. A. L. Kroeber reports customs of the Indians of California that seem to us closely analogous to those of the Hebrews: that they believe the dead unclean; that he who touched the dead would be unclean until he washed his entire body. Some tribes, the professor tells us, to this day burn the home in which one of their number dies. This custom is found also among the Indians of Nevada. Now that the government forbids the burning, the Indians refuse to live in the buildings where death occurs. Women are considered unclean for a certain number of days after the birth of a babe. These beliefs and customs and other social measures—with some modifications—are prevalent all over North America. The writer finds these customs among the Washakie Indians of Utah and with other Shoshones of Nevada. "All who have seen a dead human body are considered unclean eight days; which time they are excluded from the congregation. The Senecas observe their separations of females, as you notice of other Indians in your book (Ethan Smith)."