Recommendations for herbal healing book?

I'm in need of another herbal healing reference book.  I already have Dr Christophers School of Natural Healing and think it's wonderful.  It has been a major help for answering questions that I have.

I'd love some suggestions for other books that you all have found helpful.  I can't go online to do research at all because of how sensitive I am to EMFs and I can't rely entirely on Uny to answer all of my questions (plus the need to go online to ask those questions).  Books seem to work best these days.

Thank you friends!