Neanderthals produced birch tar through the dry distillation of birch bark.. A common staple was fish eggs with willow or birch bark. It forms up to 30% of the dry weight of silver birch bark. The hooks were fastened with wooden pegs and covered by additional sheets of birch bark. The Ojibway, or Anishinaabe, first mapped some of the area on birch bark. The Penobscot traditionally made baskets out of sweet grass, brown ash, and birch bark. All these layers were glued together and covered with birch bark. The British Library birch bark manuscripts were in the form of scrolls. After wrapping the bodies in birch bark, they buried the dead in isolated locations. Roofs were often covered with birch bark and sod. They used snow shoes, birch bark canoes and conical or domed lodges. They built bark-covered conical shelters, and traveled in exquisitely designed birch bark canoes. In March, they caught smelt in nets and weirs, moving about in birch bark canoes. They are in the Sharada and Devanagari scripts, written on birch bark and paper. In the nineteenth century, Wabanakis sold handmade ash and birch bark baskets to travelers.