Gupta, Parmeshwari Lal & Terry L. Hardaker, Indian Silver Punchmarked Coins: Magadha-Maurya Karshapana Series, Indian Insititute of Research in Numismatic Studies, Maharashtra, India, 1985, 109 pages, 8 plates, softcover. A summary of all of the types of Mauryan Punch-mark coins known at the time of writing. There are long series of line drawings of combinations of marks plus indices. Good introductory material placing the coins in an historical context. Very useful for attribution, ex James Farr Numismatic Library.
Estimate: 25-35 USD