Is it possible to switch from VFR to IFR and back?

Christopher Brian Colohan writes:

That is probably because the book is designed as supplement to IFR
training, and not as a substitute for it.

A promotional book isn't a very good supplement to any kind of
training.

The FAA publishes other books that are very informative. If it can
produce such books for VFR, which lends itself far less to book
learning, it can certainly do so for IFR. I just haven't been able to
find the right book, I think.

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