Fahey sent copies to folklorists and scholars around the country. Many 18th-century folklorists attempted to recover the "pure" folktale, uncontaminated by literary versions. The interest in folklore did not end with the folklorists before World War II. Other folklorists have interpreted tales as historical documents. Sources for these renditions include books by folklorists and commercial recordings by shanty revival performers. Most mainstream folklorists, including most of Murray's contemporaries, did not take her hypothesis seriously. Moreover, few authors were trained folklorists and even fewer maintained a critical historical methodology. "Tengu" appear frequently in the orally transmitted tales collected by Japanese folklorists. His brothers were the well-known folklorists, Jacob and Wilhelm Grimm. Other folklorists are Minakata Kumagusu, Yanagi Muneyoshi and Orikuchi Shinobu. Those were the important questions posed by early folklorists in their collections. The term "revenant" has been used interchangeably with "vampire" or "ghost" by folklorists. Other folklorists, such as Isabel Grant, have accepted this theory of a taboo. This idea has been discredited in recent years by academic folklorists. For a list of notable folklorists, go to .