The third edition was published in cooperation between the heritage association Selskabet for Oslo Byes Vel and the publishing house Kunnskapsforlaget in the autumn of 1987.
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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 third edition of Oslo byleksikon ("Oslo City Encyclopedia") was published in 1987 in cooperation between Oslo Byes Vel and Kunnskapsforlaget.