In 1990, he published På klassekampens grunn, volume two of the work Arbeiderbevegelsens historie i Norge, the history of the Norwegian workers' movement.
He then covered the welfare state history with the books 100 år for bedre arbeidsmiljø, published in 1993 at the 100th anniversary of the Norwegian Labour Inspection Authority, and Langsomt ble landet et velferdssamfunn, published in 1994 together with his life partner and colleague Inger Elisabeth Haavet.
Dei trødde sjøen published in 2004, was about his hometown, linked with broader global economic trends.
[2] Bjørnson died in December 2007 following a long-term lung illness.
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