If you want to wait a little, the "Real World Ocaml" book is being re-written. It's in beta-ish right but it looks like it would be usable.
Though the core language is the same, some of the language metaprogramming features have been totally switched out for other (better) ones. And it uses the modern versions of the Core (note, that is NOT the standard library) library.
Though the core language is the same, some of the language metaprogramming features have been totally switched out for other (better) ones. And it uses the modern versions of the Core (note, that is NOT the standard library) library.