Subset Bib Files

[Bruce Pourciau]

Suppose all my papers lie in subject A, and I have a master bib file  
(created using BibDesk) for that subject. For a particular paper only  
a subset of all the references in this master bib file might be used.  
What are the advantages and disadvantages of using that subset to  
form a separate bib file for that paper? One advantage: In LyX, I  
scroll through the references and pick the appropriate one to be  
inserted in the paper, and this is faster if there are fewer  
references to scroll through. One disadvantage: any changes to a  
reference in the master bib file have to be repeated in any separate  
bib file that contains that reference. Others?

Bruce