A while ago someone asked about where all the sketchbooks end up, and here it is. It's nice to have one shelf in the house where you can park them all in order.
That's one of the reasons I don't use spiral-bound sketchbooks: you can't write on the spine. With book-type bindings, you can write on the date and even number them. As you can see, every decade or so I switch favorite types of books. Now I'm in an experimental phase.
I'm not as prolific or industrious as it may appear--sometimes months go by with hardly a doodle. But a sketch here and a sketch there, and after a few years it adds up.