Oslo byleksikon

Oslo byleksikon (English: Oslo City Encyclopaedia) is an encyclopaedia on Oslo, Norway's capital city. It has been published in five editions since 1938. The third, fourth and the fifth editions were published in cooperation between the heritage association Selskabet for Oslo Byes Vel and the publishing house Kunnskapsforlaget. The latest edition was published in 2010, comprising approximately 6,100 entries.

The first edition of Oslo byleksikon was published by the Tanum publishing house. It was written and edited by the geographer Aksel Arstal (1855–1940), who was more than 80 years old at the time of publication. 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". Arstal also stated that he wanted the entries in the encyclopedia to be "short, accurate and factual" and without "passion".

The edition strictly followed the new orthographic reform of 1938, which was very radical for its time. In a review of the encyclopaedia for St. Hallvard, architect and antiquarian Arno Berg devoted three pages to finding errors, stating that "finding errors could be a funny sport". He nonetheless praised Arstal for his work with the encyclopaedia, maintaining that it was a "good, funny, and above all a useful book".

In 1948, the municipalities Aker and Oslo were merged, which meant an expansion of the city's area from 17 square kilometres (6.6 sq mi) to 453 square kilometres (175 sq mi). 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. This edition was less systematic than the first edition, introducing much trivia about Oslo that Just was familiar with.

In the encyclopaedia, Just enlarged the entries on Oslo's streets by adding descriptions on houses and their architects. 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. The second edition had few illustrations, even fewer than in the first.

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