For BPRD Omnis there’s actually

4 BPRD: Plague of Frogs
1 BPRD: 1946-1948
5 BPRD: Hell on Earth. (Not sure if the last one is out yet or just soon

there’s a number of side series too depending on what other characters you’re interested in. Lobster Johnson and Witchfinder being a couple of the biggest.

This may help as well
http://www.multiversitycomics.com/an...ng-order-2018/