latex referencing separately compiled book -

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I am writing a textbook and want to put the exercise in a separate book to save space. 2 books will be compiled independently, however, I want to be able to make reference to the sections in the main book book, for example "see exercise"; referee [externalfile] {formerly: afu} "Similarly, I In the main book I want exercise book to make reference to sections. Is this possible? (I'm guessing that I've got a package to do this once, but no longer remember the name, and googling is not walking)

Thank you! Kevin

Use: 

  \ usepackage {xr} \ externaldocument [Ext: Other:] {otherdoc} \ ref {ext: Other: ex: foo}

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