LawrenceA, our lists for 1930 and 1931 are quite similar.
For 1931 - 39 films seen
1. City Lights
3. Monkey Business
5. The Front Page
6. La Chienne
7. The Public Enemy
9. The Three Penny Opera
10. Little Caesar
I have a long runner up list. A Nous La Liberte, The Champ, The Sin of Madelon Claudet, Le Million, A Free Soul, and Huckleberry Finn to name a few.
I haven't seen Marius as yet, but now have copies of the original Fanny trilogy.
There are a lot of films on FrankGrimes 1930 list that I have yet to see. Many of the pre-code films just never were in circulation when I was growing up. Thankfully TCM is playing them now and I am in catch-up.