Mondrian: where are they?

I have listed all Mondrian's works by location. The page is here.
The data is mostly from the Catalogue Raisonné, which was published in 1998, with a few updates and new discoveries which I have come across.
It took a while to decide on how to present the information but geographically by city within country seemed the most useful.
Some refinement and additional research is needed, but the bulk of the data is there.

The map is an apposite image from an unnamed artist, perpetually on sale at ebay.