Almost everyone who plays copper coins knows Mr. Duan. Recommend China copper spectrum? -? -? China Coin Series B, the fourth edition, is also called "Duan Yipu" and has a corresponding "Duan Jiapu". Compared with B, A is more professional and suitable for professional collectors, while B is suitable for beginners, depending on personal preferences. There is also a teacher's collection of investment copper coins, which is also wonderful! !
These two books are full-color pages, which are informative and authoritative! ! Attached drawings: