CCNA is ICND1 and ICND2, just depends on how you intend taking the exams.
If you are planning on taking the 2 exams seperately, get the ICND1 and 2 books.
If you want to take the single exam, get the CCNA book.
However, I can see no reason why you can't buy the CCNA book and study for the ICND1 and 2 syllabusses (sp?) seperately with a little info from the Net about what exam covers what.