The book list is now over 200 titles long, covering a little more than 150 categories. I'm finding it increasingly hard to find titles in new categories. I'm finding no end of really interesting books, but inevitably, they fall into a category where I've already got books.
Last night, I added about 10 books, and got only 1 new category.
On the plus side, that list is 20% of the way done, and probably 3-4 years' worth of reading, which gives me time to find other selections.
As always, suggestions, particularly in off-the-wall topics, are welcome!