 | Donald Campbell - History - 2000 - 230 pages
...medicine emerged. The period of general history terminating in 1494, and of medical history up to 1543, is one of the most important and at the same time most difficult in European history. In other fields of experimental work, the later Middle Ages produced some outstanding... | |
 | Hans Kelsen - Law - 2002 - 368 pages
...between the validity and the effectiveness of law. The correct determination of this relationship is one of the most important and at the same time most difficult problems of a positivistic legal theory. It is only a special case of the relationship between the... | |
 | Folklore - 1933 - 466 pages
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The design and construction of the outlet arrangements is one of the most important and at the same time most difficult features of the work. 
