American Presidency Document Categories | The American Presidency Project
The core of the APP document collection is based on published collections of presidential documents. Except for recent presidents, these collections omitted many documents such as proclamations, vetoes and orders. So, prior to 1945, the number of documents in the APP collection in any specific category may be smaller than the total in existence. So, based simply on document frequencies, the APP collection overstates the activity level of the post-FDR presidency compared to earlier years.