This book is a collection of analytic studies. They are based principally on the
Sound Toll Registers (STR) preserved in the Danish Public Record Office (Rigsarkivet,
Copenhagen) and on the Sound Toll Tables (Tabeller over Skibsfart og Vere
transport gennem 0resund, vols. I, II A, II B) — i.e., printed abstracts from the
STR. Emphasis is laid on source criticism and on long controversial questions of the
balance of trade. The two last essays have a more synthetic character.