Advice Needed For Poland Compound Perforations

I have started sorting out the earlier issues of Poland and although I did have in mind that there were paper variations, I did not realize the headache that the perforations were going to be.
An example is the 1919 'Issues for Southern Poland' - Austrian currency. Stanley Gibbons' 'Poland 1st edition', lists perforations for this issue as 10-11.5 and compound.
If I understand correctly, does this mean that any single stamp can have four different perforations in the 10-11.5 range?
Does Michel perhaps have a more detailed listing or is there perhaps another referance work that may have more detail outlining these issues and later issues for that matter; it seems that compound perforations were used up to 1926?
Any help would be greatly appreciated.

*** Moved by Staff to a more appropriate forum. ***

Aside from imperf, Michel lists perf 10, 10x11.5, 11.5x10 and 11.5 for the halerzy/korona values.

The Fisher catalog may give more information on the issue

If you use a same stamp perf 10.5 example as a perf gage other perfs settings will show up in an easier manner than a perf gage.

Moose
Polish catalog with all perf types...
https://www.kzp.pl/index.php?artykul=kat-index

Thanks for the input guys.
Perf12 - excellent site, so much information. I can see that I'll be spending some time there