Thank you Jim and Kevin for suggesting the use of $8 to link the fields 
pertaining to a reproduction together when using a single record approach. 
(Jim suggested it on the PCC list and Kevin on the CONSER list.) I looked 
at the MARC documentation and it seems to me that this is a real 
possibility. Subfield 8 has been defined for 533, 538, 583, 8XX, and 856. 
Field link type of r for reproduction seems like it would definitely be 
appropriate.

I sent a message to the DLF Registry of Digital Masters Working Group to 
see what they thought, and Rebecca Guenther said that she thought it was a 
fine idea, as long as we don't expect any functionality from a system. The 
original intent was that a system could group all fields with the 
associated $8 fields together for display, but that has never happened. 
However, we could use it for this situation, and maybe someday system 
vendors would display it as was originally intended.

Someone asked for an example of what this might look like, so I copied the 
serial single record example for American journal of agricultural 
economics, which is on the CIC/CONSER/PARS draft document, and added $8 to 
533s, 538s, 583s, and 856. I also added an 830 for Cornell's digital 
collection, Core historical literature of agriculture, with a $8. The $81 
links all of Cornell's digital registry information and the $82 links all 
of University of Chicago's pretend digital registry information. The \r 
indicates this field contains information that pertains only to the 
reproduction. I'm not sure if I did this right since I've never actually 
used $8 before, so let me know if anyone sees any problems. .

The sample record is available at:

http://www.lib.uchicago.edu/~rd13/CIC/SerialSingleRecordWithSubfield8.html

What do people think? I am especially interested in hearing from those who 
objected to adding a series which applies only to the electronic version to 
the print version record when using a single record approach. Would you be 
more willing to accept such a series on the print version record when using 
the single record approach if we used $8 in this manner?

Thanks,

Renette