Executive orders (EOs) relate to the conduct of government business or to the organization of executive agencies and can be revised, revoked and amended by later EOs.
Memoranda, also called Presidential Letters, are generally issued from the President to the heads of executive departments or agencies.
Note: "The HeinOnline database is much more complete than the government-run databases of executive agreements."
Source: Curtis A. Bradley, Jack L. Goldsmith & Oona A. Hathaway, The Failed Transparency Regime for Executive Agreements: An Empirical and Normative Analysis, 134 Harv. L. Rev. 629, 669 (2020).
How to check the current status of an E.O.? See the Executive Order Disposition Tables
Published by the National Archives and Record Administration (NARA), the Disposition Tables list the status of executive orders from 1933 to date.
How to locate an E.O.? See one of the following: