Owner's manual

Suitcases
A font suitcase is a special folder for collections of fonts.
Suitcases provide a convenient way to organize fonts in the same font family.
For example, it’s a good idea to use a single suitcase (called Courier) for all
fonts in the Courier font family—all Courier roman fonts as well as fonts
with names like Courier Bold and Courier Oblique.
Note: PostScript fonts won’t go into suitcases; you can, however, organize
TrueType fonts in suitcases.
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Appendix C