https://pixbobooks.se/produkt/stamtrad-over-europas-furstehus-utg-a...
(That book is very easy to grasp... and use, and not so much full of faults, but new research has been done since it was published and therefore the book may be regarded mainly as something to get guidance and ideas from. It's creator was not lazy:
https://sv.wikipedia.org/wiki/%C3%85ke_Ohlmarks
https://en.wikipedia.org/wiki/%C3%85ke_Ohlmarks )
