Linguist David H. Kelley has criticized some of Fell's work but nonetheless argued that genuine Celtic Ogham inscriptions have in fact been discovered in America.
语言学者大卫·休米斯顿·凯利（英语：David H. Kelley）曾批评过费尔的一些作品，但尽管如此，他却认为，真正的凯尔特欧甘字母铭文事实上在美洲已被发现了。