Ladewig Petersen, E. Sweden As a Great Power 1611-1697: Government. Society. Foreign Policy, Ed. by Michael Roberts. Documents of Modern History, Gen. Edd. A. G. Dickens and A. Davies. London, Edw. Arnold, 1968. Vii + 183 S. 30 sh.; Papercover Ed. 15 Sh. ht 1970, 12.