thumb|Spine for the owl edition
(, 'Nordic Family Book') is a Swedish encyclopedia that was published in print from between 1876 and 1993, and that is now fully available in digital form via Project Runeberg at Linköping University. The public domain editions of the encyclopedia remain important reference works in Finland, especially on Finnish Wikipedia.
History
First edition
thumb|left|First edition (1876–1899), featuring [[Idun logo]]
thumb|The Owl Edition (1904–1926), featuring its namesake as its logo
began when Halmstad publisher hired an editor, linguist , in 1874 to publish a six-volume encyclopedia. Linder drew up a plan for the work, designed the editorial team and created a large circle of experts and literary figures, who submitted article proposals and wrote and reviewed them. Under Linder's direction, the articles were then edited to make them as formal, consistent and accurate as possible. Much attention was paid to Nordic subjects, mainly Swedish and Finnish, where sources and models were often lacking, so extensive and time-consuming pioneering work had to be done. As a result, the earlier plan for the scope and publication period of the work was soon abandoned.
The first edition of was published in 20 volumes between 1876 and 1899, and is known as the "Idun edition" because it bears a picture of Idun, the Norse mythologic goddess of spring and rejuvenation, on its cover.
This was published over almost a quarter of a century, and particularly the first ten volumes contain material which is not seen in later editions. A good example of this is found in the end of the Berlin article (which is included in the second volume, from 1878), where the author finishes his article by talking about the public decency and morality, which he finds to be very poor. The author continues by complaining about there being a very lazy interest in religious matters and concludes: "to all these joint circumstances, one can hardly defend oneself against the thought of future threatening dangers".
Linder was editor until 1880, when he was succeeded by lexicographer , first archivist at the National Archives Theodor Westrin, and B. F. Olsson.