They didn't. It was the Bee Gees in 1979
See the link below for the full list of Abba single releases.
January 1978.
Abba Abba has 128 pages.
ABBA released the hit "Money, Money, Money" in 1976. The track was recorded in May and released in November. "Money, Money, Money" was also performed in ABBA's hit musical Mamma Mia!
The worldwide release and the Australasia release of the Abba Gold Album both have nineteen tracks on them. In Europe, a special edition bonus CD was released as well which included eleven extra songs.
See the link below for the full list of Abba single releases.
Biography - 1987 ABBA was released on: USA: 28 December 2005
March 1975
January 1978.
April 21, 1975.
Abba Abba has 128 pages.
A Jungle Tragedy - 1917 was released on: USA: 28 January 1917 (re-release)
I believe it was Super Trouper in 1980. But ABBA Gold has been on the top of the charts as a re-release and it continues to outsell world-wide.
The Mike Wallace Interview - 1957 Abba Eban was released on: USA: 12 April 1958
Tragedy at the Mill - 1909 was released on: USA: January 1910
The Tenderloin Tragedy - 1907 was released on: USA: May 1907
An Alpine Tragedy - 1914 was released on: USA: June 1914