Available Indexes

HathiTrust Overlap Reports for ETAS

April 21, 2020

In order to assist members in evaluating the utility of the Emergency Temporary Access Service, HathiTrust can provide reports indicating which items included in your most recent print holdings submission would be available through the service.

Information on how to add ETAS records to your local catalog is available on our website. See below for details on receiving your overlap report or updating your holdings.


As with most other HathiTrust operations, overlap is determined by matching the OCLC Control Numbers (OCNs) in your print holdings to the OCNs in the bibliographic records for the items in our digital collection.

 IC Overlap & ETAS Access


Report Structure

Reports are provided as tab-delimited text files (.tsv) and include all of the print holdings we received in your most recent submission.  Reports include the following fields:


Field Name




OCLC control number

As provided in your print holdings


Local identifier

Either your local_system_id or local_item_id, whichever you provided to us in your print holdings



Possible values:

  • mono (for single-part monographs)
  • multi (for multi-part monographs)
  • serial (for serials)


Note that our system overwrites member-provided values in this field for multi-part monographs only, if the matching bibliographic record from our collection has a value of item_type=”multi” for the same OCN.


Indicates whether access to the item is permitted under normal operating conditions

Possible values:

  • allow (full view)
  • deny (limited view)


Indicates the rights status of the item, according to our standard rights determination process

Possible values:

  • ic (in-copyright)
  • pd (public domain)
  • und (undetermined; treated as ic for access purposes)


Records with values in the “access” and “rights” columns were successfully matched to something in our digital collection.  Records with no values in these fields could not be matched to anything in our collection.

Values in the “access” and “rights” columns are derived from our holdings database, so they reflect the access determinations that would apply under normal (non-ETAS) conditions.  Under those normal conditions, your users have access only to the "allow" records.

If your library is approved for ETAS, your users will have access to both the "allow" and the "deny" records for the duration of the service.

Accessing and Updating Your Report

We generated a first round of reports for all members on March 17, 2020 that members received as a Box folder link in the email confirming ETAS activation. New reports that reflect our latest print holdings build were generated on April 13, 2020.  Reports will become stale over time, for example matches for any items added to the HathiTrust collection after the reports were run will not be reflected.  If you have extenuating circumstances (i.e. you are aware of a large, recent deposit or have undertaken OCLC reclamation or other cleanup projects), and you would like a fresh report, please email us at feedback@issues.hathitrust.org and we will try to accommodate your request as time permits. 

Note that your access to ETAS items in your collection will update every day as new material is ingested, so those newly deposited items will be available to you if they match your holdings.

Please contact feedback@issues.hathitrust.org with any questions or to apply for the service.