Does this ProQuest "docview" URL include a DOI?
It's not a DOI. It's probably a ProQuest-specific identifier.

First, it's not in the correct form: DOIs look like "10.1000/xyz123".

And as a rule, to check if something is a DOI, you can enter it into the resolver on http://doi.org

Here you get a "not found" error i.e. it's not a DOI: