atz

{
  "001": {
    "repeatable": false, 
    "subfields": {}, 
    "description": "The control number assigned by the organization creating, using, or distributing the record. The MARC code for the organization is contained in field 003 (Control Number Identifier)."
  }, 
  "003": {
    "repeatable": false, 
    "subfields": {}, 
    "description": "The MARC code for the organization whose control number is contained in field 001 (Control Number)."