The book "Crisis of the Swedish-Norwegian Union: A Documentary History" by Carl Nordlund is a study of an important era in the history of Sweden and Norway. The author explores the complex relations between the two Scandinavian countries in the 19th century, when their efforts to preserve the union faced serious internal conflicts. Carl Nordlund uses a wide range of documents - from government declarations to personal letters - to reveal the full depth and complexity of the political crisis of the time. This book will be a useful resource for both historians and anyone interested in the political history of Northern Europe.