I don't mind either internet/computer, or book resources as they each have their merits to me. With the computer, I can CTRL + F anything specific with ease. With a book, it's easier to browse. Relatively speaking, that is.
Wow... it looks a lot smaller in the picture... I just got two of these and the 1901-2000 book is 3.25" thick!
...And the S. Korean publisher, "DaeGwang-sa's" (대광사) "Republic of Korea Currency Price Catalog" for Korean coins: http://item2.gmarket.co.kr/Item/detailview/Item.aspx?goodscode=398339720 ...And the Tankobon Japanese coin catalog: http://www.amazon.com/The-Catalog-Japanese-Coins-Banknotes/dp/4930810175