In 1994, and afterwards, textual evidence that the Walam Olum was a hoax was supplied by David M. Oestreicher in "Unmasking the Walam Olum: A 19th Century Hoax." Oestreicher examined Rafinesque's original manuscript and "found it replete with crossed-out Lenape words that had been replaced with others that better matched his English 'translation.' In other words, Rafinesque had been translating from English to Lenape, rather than the other way round". In general, he found a variety of evidence that the "Walam Olum" was not an authentic historical record but was composed by someone having only a slight familiarity with the Lenape language. Oestreicher argued that Rafinesque crafted the linguistic text from specific sources on the Delaware Language published by the American Philosophical Society and elsewhere. Further, he said that the supposedly "Lenape" pictographs were hybrids from published Egyptian, Chinese, and Mayan sources.