The book "Variation in Thickness & Ash Content-Coal Seam-Ii, Barjora, Wb, India" by Sumit Saha provides a comprehensive study of the coal seams in the Borjora coalfield, which is part of the Trans-Damodar sector. It highlights the geological conditions of the region, which has been known for mining since the 18th century but was inadequately explored for a long time due to the overburden of lateritic or alluvial soils. Subsequent investigations have confirmed the presence of coal-bearing rocks, particularly the Raniganj and Barakar formations, at relatively shallow depths. The findings indicate that the central part of the area is more promising than the northern and southern sections. The book addresses the variations in thickness and ash content of the coal seams, which are crucial for determining the usability of coal. Additionally, it provides fundamental insights into the morphology of the basin and the environmental conditions of deposition.