I once blogged about the lack of word for this smell[0], and came across someone else that has asked this[1] too. Just like 'petrichor' for the smell of fresh earth following rain.

I made up my own word for this, in Norwegian: 'Gammelbokduft'.

[0] https://earth.hoyd.net/lukten-av-gamle-boker-118/ [1] http://english.stackexchange.com/questions/57416/word-for-th...