Solvej Balle books in order
3 books in the catalogue, about 10 hours of reading in all; the shortest takes 3 hours and the longest 4 hours.
1 series in the catalogue.
On the Calculation of Volume
7 books 1 
On the Calculation of Volume I 3.0 h 2 On the Calculation of Volume II 3.2 h 3 On the Calculation of Volume III 3.8 h
On the Calculation of Volume I 3.0 h 2 On the Calculation of Volume II 3.2 h 3 On the Calculation of Volume III 3.8 h 4 On the Calculation of Volume IV length not known
5 On the Calculation of Volume V length not known
6 On the Calculation of Volume VI length not known
7 On the Calculation of Volume VII length not known