Book About Swedish-Finnish Folk Music

A book about Swedish-Finnish folk music by Niklas Niqvist came to my attention when I looked up a folk music song title on the internet. The focus of the book is on the collectors who brought together the folk songs for publication and preservation in the early twentieth century. This book was published in 2008. Close to the end of the book is a summary in English. Songs from this books were a part of the performances of the Runeberg Choir.