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In MarcEdit

1-Make a new 001 field:

  • Delete the incorrect 001 fields using Add/Delete Field

  • image-20240418-150618.png

  • Go to Tools; Build a New Field:

  • =001 {035$a} ← 2 spaces exactly in front of curly brackets

2-Go to Tools; Edit Field Data:

  • Field: 001 Find: (OCoLC)

  • Position: [blank] Replace: on

    image-20240418-151434.png

  • Save

Unfortunately, OCLC 001 numbers vary according to length:

The OCLC control number in field 001 is prefixed by ocm, ocn, or on.

OCLC numbers 1 through 99999999:

  • Have an ocm prefix

  • Composed of 8 digits, right justified, with leading zeros

  • Followed by a blank

OCLC numbers 100000000 and higher:

  • Have an ocn prefix

  • Composed of 9 digits

OCLC numbers 1000000000 and higher:

  • Have an on prefix

  • Composed of 10 or more digits

ocm00012345

ocn123456789

on1345345345

We can look at them to make sure they do fall into the differing sets of OCLC prefixes:

image-20240418-212116.png

  • File: Select Records for Edit:

  • image-20240419-142019.png

  • Search:

    • Field F#:001.{1,8}

    • Import File

  • Display Field: 001

  • Click on Display Field (001) to sort it

  • scroll down to first 9 digit number

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