Oslo byleksikon

In the edition's preface, Arstal states that "the book should contain everything what an Oslo citizen ought to know about the city and the region he frequently visits".

Journalist and author Carl Just (1897–1990) thought that the new, expanded city needed a new encyclopaedia, and started working on the second edition, which eventually was published in 1966.

The art historian and urban planner Bjørn Sverre Pedersen (1926–2003) assisted Just with the entries on architecture, though he was not credited in the edition's preface.

Just added a new feature in the second edition: A large entry on Oslo in the beginning of the book, containing information on urban planning, nature, geology, plant and animal life, history and politics.

This edition introduced tables containing information on the city's mayors, award winners, theatre directors, monuments and memorials.

The new content comprised entries on the new administrative boroughs, the Oslo forest, organisations, newspapers, minor sports clubs and political parties.

The digital encyclopedia was officially launched on 6 February 2020 and has been realized with financial support from, among others, Fritt Ord and the City of Oslo.