Two fields in the APIS contribution format include institution codes, namely dd035 and dd852.  The institution codes to be used for APIS are those listed in the MARC Code List for Organizations, which is available in print from the Library of Congress or online at: http://www.loc.gov/marc/organizations/.

Below are details and examples.

• dd035 (System Control Number)
  
  The dd035 field follows the usage and structure of the MARC 035 subfield $a, as described at: http://lcweb.loc.gov/marc/bibliographic/ecbdnumb.html#mrcb035
  
  In particular, note that the institution code is enclosed in parentheses ahead of the contributing institution's record control number.
  
  Examples:
  
  dd035 | 1 | (NDD)29886014      (for a record from Duke)
  dd035 | 1 | (NNC)apis.p0398     (for a record from Columbia)
  dd035 | 1 | (MiU)1682               (for a record from Michigan)
  dd035 | 1 | (CU)1009                (for a record from Berkeley)
  dd035 | 1 | (NjP)apis.o0012      (for a record from Princeton)
  dd035 | 1 | (CtY)10                   (for a record from Yale)
  dd035 | 1 | (CaOTU)12             (for a record from Toronto)
  
  
  
• dd852 (Location / Repository)
  
  The dd852 field follows the usage and structure of the MARC 852 field $a, as described at: http://lcweb.loc.gov/marc/bibliographic/ecbdhold.html#mrcb852.  
  
  Examples:
  
  dd852 | 1 | NDD            (item located at Duke)
  dd852 | 1 | NNC            (item located at Columbia)
  dd852 | 1 | MiU              (item located at Michigan)
  dd852 | 1 | CU               (item located at Berkeley)
  dd852 | 1 | NjP              (item located at Princeton)
  dd852 | 1 | CtY              (item located at Yale)
  dd852 | 1 | CaOTU        (item located at Toronto)