So, what exactly is "JFV"?

[NickM]

gang

I keep seeing people referring to JFV from Jochen Prien. Sorry to seem like a dull, monolingual type of fellow, what exactly IS this book/book series/etc?

How is it organized (I keep seeing reference to 'Teil' and 'Teilband' and a random translation just calls it 'part' IE: Teil 1 = Part 1) and what is supposed to be/have/describe?

Thanks, ahead of time

NM