What about placing the book in an acid-free, archival cover to protect the
book from light, dust, etc.  The cover also acts as a sort of buffer when
there are environmental changes.  The number could be written on the outside
of this cover.  The type of protective covering I am describing can be found
in archival ordering catalogs (such as Gaylord, etc.)

Just a suggestion.

Sincerely,
  Ginger M. Young

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