A Publication Exemplar is a specific copy of a of serially produced work. It represent the exact intellectual or artistic content of a specific source object. This might for example be a copy of a book with your personal annotations or a CD signed by the band leader.
A Publication exemplar may generally be an exemplar of a specific serially produced source like book exemplar, thesis exemplar, technical report exemplar, but it's also use for more specific documents such as map exemplar (if it was edited and diffused).It might also be used for referencing an exemplar of a piece of art serially produced like designer furniture, watches, or photographs etc.Along the same line, a specific coin or a specific bill can be considered as a Publication Exemplar.