31. Roofs were often covered with birch bark and sod. 32. A Russian birch bark letter ( 14th century ). 33. The hooks were fastened with wooden pegs and covered by additional sheets of birch bark . 34. The halves are once again joined together and then wrapped in birch bark or osier rings. 35. Birch bark is still used in some parts of India and Nepal for writing sacred mantras.36. In Finland, m�mmi, a traditional Easter food, was packed and baked in boxes of birch bark . 37. A related drink is made from birch bark _ or was _ and is called birch beer. 38. Pieces of sod must be laid out immediately after the birch bark , to keep it in place. 39. The sculpture celebrates the birch bark canoe as the origin of the maritime tradition in this region. 40. There are many examples of it on birch bark records and in drawings made by Indian Informants.
