Cythera Data Subindex 20

Superficially somewhat similar to resources of subindex 19. They appear to be associated with maps that have multiple regions in the same 80xx map resource, i.e. something different appears in the main window, it doesn't all show up at once on the automap, and so forth.

 ---- SUBINDEX 20 ---- 
Index 0, ID 1500 Length: 64 bytes
Index 1, ID 1501 Length: 54 bytes
Index 2, ID 1502 Length: 88 bytes