According to Billboard magazine, the ten top selling albums from 1970 through 1979 were:

1970  Simon & Garfunkel – Bridge Over Troubled Water
1971  Various Artists – Jesus Christ Superstar (Original Soundtrack)
1972  Neil Young – Harvest
1973  War – The World Is A Ghetto
1974  Elton John – Goodbye Yellow Brick Road
1975  Elton John – Greatest Hits
1976  Peter Frampton – Frampton Comes Alive
1977  Fleetwood Mac – Rumours
1978  Various Artists – Saturday Night Fever (Original Soundtrack)
1979  Billy Joel – 52nd Street

In the United Kingdom, the top selling albums from 1970 through to 1979 were as follows:

1970  Simon & Garfunkel – Bridge Over Troubled Water
1971  Simon & Garfunkel – Bridge Over Troubled Water
1972  Various Artists – K-Tel’s 20 Dynamic Hits
1973  Elton John – Don’t Shoot Me I’m Only The Piano Player
1974  The Carpenters – The Singles: 1969-1973
1975  The Stylistics – The Best Of The Stylistics
1976  ABBA – Greatest Hits
1977  ABBA – Arrival
1978  Various Artists – Saturday Night Fever (Original Soundtrack)
1979  Blondie – Parallel Lines