I had a friend who managed the network for Bechtel, set my BBS up to pull in usenet that many said it wasn't possible; my setup was his proof.
What year? Didn't many BBSes do this with (non-UNIX) implementations of the UUCP protocol? I also thought some FidoNET systems had gateways to Usenet (I saw a brief mention on the wikipedia article but not sure how long back that went).
There were always gateways but at 10 a minute it was spendy, newsgroups weren't a priority for me
I was a chat board (8 lines). I did use PC prusuit for my personal files http://www.bbsdocumentary.com/library/CONCEPTS/SERVICES/PCPURSUIT/
I ran an AmigA 3000, Cnet software and was part of the FidoNet. Cnet was getting ready for the Internet; we had a cookie file
which was a text file of his wife's recipe for chocolate chip cookies, but a cookie file was required so he added one.
FidoNet does connect to the Usenet, but just as another group. From the Usenet you can read FidoNet, but not the other way around
I can't tell you how it was done as my friend set it up (UUCP protocol and all the supporting files for the Amiga and Cnet) which was easy for him.
His system was a Sparc workstation, we were worlds apart in computer systems
I pulled my messages from him who was pulling them from across the state. I'd pay him a bit for my feed (a couple Amiga text groups)
but his largest group was for the NeXTstation, so most likely around 1990-91.