What format do Apple IIGS CD-ROM's use?

I am trying to make a CD-ROM that is readable on an Apple IIGS. What format did Apple II CD-ROM's use? I'm assuming that they were not ProDOS because ProDOS has a maximum capacity of 32MB. They must have been some kind of hybrid format.

This article (from a search including Archives) says they are ISO 9660:
SYSTEM SOFTWARE:
The Apple IIGS Personal computer features Version 5.0.4 of Apple IIGS System Software, including the following:
• GS/OS Operating System. Exclusively created for the Apple IIGS personal computer, GS/OS dramatically increases the speed of both disk access and program launching. It also includes File System Translators (FSTs) that allow applications to directly access files created using other file systems, such as the ISO/High Sierra file system used by CD-ROM devices.
-- from: 7889- Apple IIGS (1MB, ROM 03): Specifications (Discontinued 12/92)

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