You should really support the autor and buy the books if you do like it,
nothing is better than a real book and its very convenient and you can read
anywhere, it can be found on amazon or in any good bookstore. The author deserve
it for thoses marvelous books.

http://www.amazon.com/exec/obidos/tg/detail/-/4889960759/qid=1083838388/sr=1-2/ref=sr_1_2__i2_xgl14/002-2092224-6420824?v=glance&s=books
http://www.nanzan-u.ac.jp/SHUBUNKEN/publications/miscPublications/Remembering_the_Kanji_1.htm

Remember the Kanji I: ISBN: 4889960759
Remember the Kanji II: ISBN: 0870407481
Remember the KanjiIII: ISBN: 087040931X
Remember the Kanji Study Card: ISBN: 0870408852