Chronologically:
De brug (The Bridge, 1928, doc, sh) - 8/10
Regen (Rain, 1929, doc, sh, co-d) - 8/10
Misère au Borinage (1933, doc, sh, co-d) - 8/10
Nieuwe gronden (New Earth, 1934, doc, sh) - 8/10
The Spanish Earth (1937, doc) - 7/10
...A Valparaíso (Valparaiso, 1962, doc, sh) - 9/10
Le mistral (1965, doc, sh) - 9/10
I'm positive I've seen 'Seine' and 'Valparaiso' as well (on the big screen, no less), but silly as I am never took any notes about seen shorts back then (so no 'official' rates either). Blah!

EDIT! Oh well, watched Valparaiso (without any translation though *sigh*) again. Yay?