Well, actually I list all the Asimov books as "Foundation", ordered from the early days of "
I, Robot".
Essentially, the list that Wikipedia calls the "Greater Foundation".
Which includes five distinct, entirely chronological subseries.
"Galactic Empire" is actually the canonical way of describing subseries #2,
The Stars, Like Dust,
The Currents of Space, and
Pebble in the Sky.
I don't know what you would do with Wodehouse, and I haven't gotten to organizing Christie yet.