The 1962 Missale Romanum incorporates the 1955 Holy Week changes. However, the stand-alone Ordo includes specific rubrical details (e.g., for the Veneration of the Cross on Good Friday) not found in later hybrid editions.
Digital Archives: Websites like the Internet Archive often host scanned copies of the original 1955 and 1956 editions printed by Pustet or the Vatican Press. ordo hebdomadae sanctae instauratus pdf install