| Tag | Ind 1 | Ind 2 | Subfield Codes | Value | Definition |
| 948 | | | | | LOCAL STATISTICS AND MARKER FIELD |
| *blank | | | | Reserve transaction (also used for migrated data) |
| 0 | | | | Precataloging transaction |
| 1 | | | | Cataloging transaction |
| 2 | | | | Postcataloging transaction |
| 3 | | | | Other transaction (including bulk import) |
| | *blank | | | Undefined |
| | | $a | | Date (in format YYYYMMDD)--(also used for migrated data) |
| | | $b | | Type of transaction |
| | | | a | Added copy (1st indicator = 2) |
| | | | b | Recataloging (1st indicator = 2) |
| | | | c | Copy cataloging (1st indicator = 1) |
| | | | f | Fastcat (1st indicator = 1) |
| | | | i | Inputting (1st indicator = 0) |
| | | | k | MARCadia fast processing (1st indicator = 1) |
| | | | l | Added location (1st indicator = 1) |
| | | | m | Maintenance (1st indicator = 0 or 2) |
| | | | o | Original cataloging (1st indicator = 1) |
| | | | r | Receiving (1st indicator = 0) |
| | | | s | Fastshelve (1st indicator = 1) |
| | | | u | Upgrade to PCC (1st indicator = 1) |
| | | | v | Cataloging, type unknown (1st indicator = 1) -- MUSIC only, non-PCC |
| | | | w | Withdrawal (1st indicator = 2) |
| | | | x | Recon (1st indicator = 2) |
| | | | y | Reclass or SH assignment (1st indicator = 2) |
| | | | z | Classification-on-receipt (1st indicator = 1) |
| | | $c | | Semester or other time period -- CIRC only |
| | | $d | | Staff member performing transaction (initials, net ID, batch, etc.) |
| | | $e | | Processing location |
| | | | cts | Library Technical Services |
| | | | ilr | ILR Library |
| | | | law | Law Library |
| | | | mann | Mann Library |
| | | | music | Music Library |
| | | | rmc | Rare and Manuscript Collections |
| | | $f | | Special format |
| | | | e | E-resource (remote/networked non-serials) |
| | | | fd | E-resource (for items added to Find Databases) |
| | | | j | E-journal (remote/networked serials) |
| | | | m | Microform |
| | | $h | | Source information |
| | | | aclsebook | ACLS E-Book (bulk import only) |
| | | | appr | Approval/Blanket order |
| | | | | batchmatch | Batchmatch (bulk import only) |
| | | | books24x7 | Books24x7 |
| | | | CJKSCRIPT | CJK RLIN snapshot (bulk import only) |
| | | | dep | Deposit |
| | | | EEBO | Early English Books Online (bulk import only) |
| | | | exch | Exchange |
| | | | gift | Gift |
| | | | Iberbook | Iberbook |
| | | | ILL | Buy or borrow? |
| | | | marcadia | MARCadia (bulk import only) |
| | | | Marcive | Marcive (bulk import only) |
| | | | misc | Miscellaneous |
| | | | mso | Monographic standing order |
| | | | nerl | NERL |
| | | | npac | NPAC |
| | | | netLibebk | Net Library (purchased) |
| | | | XnetLibebk | Net Library (unpurchased) |
| | | | nylink | NYLINK |
| | | | OCLCCJK | Outsourced CJK cataloging (bulk import only) |
| | | | ord | Wason ACQ orders (non-Voyager) |
| | | | pl480 | PL480 |
| | | | Proquest | Proquest |
| | | | recon1 | Recon Set A (bulk import only) |
| | | | recon2 | Recon Set B (bulk import only) |
| | | | Reserve | Reserve (CIRC only) |
| | | | SerialSolutions | Serial Solutions |
| | | | thesis | Thesis (Mann only) |
| | | | yankee | Yankee |
| | | | YANKSR | Yankee Shelf Ready (bulk import only) |
| | | $i | | Filename (for bulk imports) or other source information |
| | | $j | | Library cataloged for |
| | | | gnva | Geneva Library (Mann Library use only for $b=w) |
| | | | hort | Horticulture Library (Mann Library use only for $b=w) |
| | | | hote | Hotel Library |
| | | | mann | Mann Library (Mann Library use only for $b=w) |
| | | | orni | Ornithology Library (Mann Library use only for $b=w) |
| | | | vet | Veterinary Library |
| | | $x | | Note |