Birch trees are trees that can grow on the highest altitudes among trees at typically more than 3500 meters above sea level. In India they can only be seen in Himalayan region. Use of bark as paper has been mentioned by early Sanskrit writers such as Kalidasa (c.4th century CE), Sushruta (c.3rd century CE), and Varahamihira (6th century CE). Early scholars recounted that all of their books were written on Himalayan birch bark until the 16th century.
