ISHRemote - How can I get a count of logical layer only ignoring language and version layers?

Hi,

I am trying to get a list of the objects in all folders with the name Global Topics.

I don't want to know all the language and version layers, just the unique GUIDs.

How do I filter the objects returned by 

$folderObj = Get-IshFolderContent -ISHFolder $folder

$ishobjects = Get-IshDocumentObj -IshObject $folderObj

to not include every version and language layer

Any advice appreciated,

Regards,

Ann