Records are added to OSTI.GOV on a daily basis.  They are accessible via the MARC records download feature. The bulk download zip file of the whole collection is updated on a quarterly basis.

• Downloading new records at regular intervals, such as monthly, is the option taken by many libraries.
  
  
• If you are selecting records by Subject Category, you can receive weekly automated notices of new records by signing up for an OSTI.GOV Account.  Once you have an account, perform a search of the Subject Category using OSTI.GOV Advanced Search.  In the Subject box, enter the subject category name enclosed in double quotes (i.e. "power generation and distribution").  When you get the search results, click on “save this search to My Library” in the left column.  Enter a title for the search and click in the box to be notified when document matches are added or updated.  You will receive an email when new records in your subject category are added.