If it gets me reprint royalties, I'm all for it. Although
Forgotten History is a bit of an odd choice there since it's not quite as standalone as the other two, tying in to both
Ex Machina and
Watching the Clock. (Though it has a bit of a nod to
The Rings of Time too.)
Oh, and the plural is "omnibuses."
Omnibus is a plural adjective in Latin -- the suffix is the dative plural -ibus, not -us -- so it's only a singular noun in English (short for "omnibus volume"), and thus is pluralized per English rules.