As I understand the history, much of the original Minnesota Educational Computing Consortium (MECC) catalog was written on their own timeshare platforms, which appear to be mostly the GE (and thus Dartmouth BASIC) and later a Cyber. It appears many of these were also released on the HP2000 series, which is a very different dialect.
I came across a reference to something called "MECC Quick Reference Guide for BASIC Language Version 3.1", but the link is dead and archive.org's first capture started three years after it was posted and already gone.
Does anyone have anything on MECC's BASIC standards, and perhaps a copy of this document or similar?