Selwyn Dewdney, art educator and researcher into Ojibwa art and anthropology, wrote the only comprehensive study of the Ojibwa birch bark scrolls ("wiigwaasabakoon"). In it he wrote: "A surviving pictographic record on wood, preserved by the Algonquian-speaking Delaware long after they had been shifted from their original homeland on Atlantic shores at the mouth of the Delaware River, offers evidence of how ancient and widespread is the myth of a flood (see Deluge (mythology)) involving a powerful water "manitou". The record is known as the "Walum Olum" (Painted Sticks), and was interpreted for George Copway by a Delaware Elder ... Apart from the reference to man's moral wickedness, the mood and imagery of the "Walum Olum" convey an archaic atmosphere that surely predates European Influence." A review of his study by the anthropologist Edward S Rogers states "Dewdney is apt to rely upon ethnographic generalizations that were in vogue a quarter of a century ago, but in the intervening years have been modified or disproven ... Dewdney handles ethnohistorical matters no better than he does ethnographic topics ... Dewdney has deceived the unwary that do not realize that the exact distributions and certain proposed migrations of Ojibwa still remain unresolved. A final word, but one that is of paramount importance, must be voiced. How will the Ojibwa react to this book? Most likely, negatively, from the few comments received to date. The fact that "Sacred" information is being divulged will be resented."