The things that I practice other than judo are so obscure that even these guys won't cover them. I did appear in some of their publications doing a kata once, and sticking a jo into Lurch's face.
I have not read Murata sensei's book - he was disappointed that a very similar book came out a few scant months before his, and I think its sales prospects were not helped by that.
The Budokan often takes a long, serialized article and publish a book at the end of it. That's how Murata sensei's book was first published, as articles.
Not really checked into Yamaguchi sensei's book but will end up buying both; sometimes if they don't sell well, after the small initial run they'll not print more.