They are mostly from the library's Haig collection, but also include more than 100 evocative photographs of tenements on the south side of Edinburgh taken in 1929. They include another historic milestone from the library's collection, the order for the Massacre of Glencoe.
A small selection of images were put on Flickr on a trial basis 18 months ago, but most of the 2,000 were added in recent weeks. Several thousand people have already viewed them. The library plans to add more - a total of 3,000 images by the end of the year.
You can read more in an article by Tim Cornwell in The Scotsman at http://thescotsman.scotsman.com/news/National-Library-of-Scotland39s-historic.6430516.jp