THE -A or -U ENDING IN MASC. NOUNS DEFINED

This more than 400-page book is the definitive study on where the -a or -u are used in the gen. sing of masculine nouns. I recall that Westfal had created myriad categories, some containing only 3-4 examples, such as one that said something like (I'm recreating from memory) the -a ending is used in relation to 17th-century Austrian coins....

The book is still available:
A Study in Polish Morphology. The genetive singular masculine. (Hardcover)
by Stanislaw. WESTFAL (Author)
Available from these sellers.
1 used from £30.00 1 collectible from £37.50
Product details:
Hardcover: 418 pages
Publisher: Mouton; First Edition edition (1 Jan 1956)
ASIN: B001CZKQHY

In know the book quite well and serves as a gentle reminder of the pitfalls awaiting those learning Polish!

An exhaustive reference.

Yes but it must be a very boring buying a huge boring book just learning the genitive case. There is much more interesting things to learn in life than when to use a silly 'a' or a silly 'u' on the end of silly Polish words!

....as with Poles learning the intricacies and subtleties of English tense usage?? LOL

Polski język, strasznie trudny!

I've posted elsewhere on this, there was a ding-dong debate

Still, interesting topic

Język Polski jest bardzo trudny.

I don't usually try to memorise abstract rules, I just remember from examples I read or hear. There are so many tricky unpredictable exceptions in Polish I could never expect to memorise all the rules.