Probably the most important and most referenced book on British bronze coinage. It's numbering system, which is often abbreviated simply with an 'F' prefix, is used all over the world by sellers of British bronze coins, including all the major international auction houses to distinguish one 'Freeman' variety from other similar coins.
The author Michael J. Freeman once had over 60,000 Victorian pennies plus thousands of other British bronze coins. He devoted over 35 years to the study of them and identified and organised them, assigning each a unique and logically number. His numbering system and book on bronze coinage is still used as the standard reference more than 45 years after it was first published.