Collections and boxsets that include silent era Fritz Lang films:
Fritz Lang Epic Collection (1924-1929)
Fritz Lang: The Early Works (1919-1921)
Fritz Lang: The Silent Films (1919-1929)
Fritz Lang Epic Collection (1924-1929)
The History of Cinema (1915-1927)
The History of Cinema (1915-1927)
Silent Classics (1920-1927)
Triple Feature Horror Classics, Volume 1 (1922-1927)

About Fritz Lang:
Fritz Lang: Circle of Destiny (1998)