protocol for obtaining holdings not on/from OCLC

[emily nedell tuck]

Hi,
 
Sorry for the repost. I just wanted to clarify since people responded about 
pulling data out of OCLC-- I have three different catalogs I would like to 
bring together, including the holdings records. Is there a way of grabbing the 
holdings data and not just the bib data? I want to create one federated 
search/union catalog; I don't know how to get to the 852 since my understanding 
is that it is not part of the z39.50 standard.
 
Thank you,
 
Emily