House Committee Print 95-66 is a historical report covering unfair trade practices by foreign governments and related reviews.

In the U.S. healthcare system, "66" appears in manual instructions and reporting forms: House Committee Print 95-66 - GovInfo

Various high-level government reports are indexed under the number 66:

Establishes the requirements for certifying staff involved in aircraft maintenance.

In the aviation industry, refers to the European Union Aviation Safety Agency (EASA) standard for the Aircraft Maintenance License (AML) .