Maybe, but I’ve searched for it many times out of curiosity, but have never managed to locate it online, and wouldn’t know if paper copies exist.

From Wikipedia, I get to https://web.archive.org/web/20010204033600/http://publib.bou...

That has one live link: https://web.archive.org/web/20010107084700/http://publib.bou..., but from there, the trail runs dead.

Do you have a link?

This one maybe? https://archive.org/details/ibm-saa-cua-basic-interface-desi...

PDF link in the box on the right.