Its possible that their internal names do not match their external names. Search for their external names in the file export_unit.txt and this will point you to their dictionary name. Then search for this in the export_descr_unit.txt, this will get you the type name for the unit, and you can then search for that name in the export_descr_buildings. If you aren't sure of an internal name always search for the external name in files in the "text" folder, as this lines up with internal names with the external names (counts for pretty much everything in RTW).

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