One source is e.g. Kortfattad svensk språkhistoria by Gösta Bergman. Bengt pamps Svenska dialekter would work fine as well. If you want to, I can even contact my dear friend professor Staffan fridell at Department for Nordic langauges, Uppsala university. (I have already employed his knowledge in my correct claim that Old Swedish had diphthongs, contrary to the original incorrect claim of the article on the Swedish language.) Since I know you have a severe tendency of interpreting sourcing in your own way, I would like you to quote and scan your graphical data in NE and Svenska språket under sjuhundra år. Please. 
 ::Jens Persson ( )