A series of columns published in Dragon Magazine.
From the website of Wizards of the Coast:
Ed Greenwood's Wyrms of the North column ran from Dragon Magazine 230 through 259, detailing over two dozen unique dragons of Faerûn. Although written for 2nd edition AD&D, the original articles largely eschewed game statistics in favor of descriptive text, with the exception of the occasional spell or magic item. These articles will be reprised in a regular column on the Wizards of the Coast website with the addition of game statistics and updated spells and magic items for the new D&D.