It all depends on what you are looking for.
Books that grow feet are usually not easily found.
PvR

Frank Reichenbacher schreef
I've been out of the botanical loop for quite a while and when I went to
look up something in my Cronquist 1968 I found that it has grown feet and
wandered away from my abode.

Is there anything to replace it of equal utility, portability, and
comprehensiveness?

Frank