[pja]

There were a lot of ALGOL variants around in the 1960s & 70s if you look at the Wikipedia page for ALGOL, including one called GOGOL for the PDP-1. My first guess would be that POGOL was an ALGOL-a-like for the IBM-360, perhaps developed internally by the NSA?

[nl → pja]

I would assume an ALGOL variant.

Given that this was in '78 (which is quite late in ALGOL's lifetime), it's possibly the "P" referred to the P-porting kit for Pascal[1]?

That's speculation of course, but the ALGOL name variations generally did mean something.

[1] http://en.wikipedia.org/wiki/Pascal_(programming_language)#T...