The Societies of Europe is an 8-title series of historical data handbooks and accompanying CD-ROM sets on the development of Europe from the nineteenth to the twentieth century. The series is a product of the Mannheim Centre for Social research, a body dedicated to comparative research on Europe and one of the leading social research institutes in the world. It is a collection of datasets giving a clear and systematic study of long term developments in European society. The data is presented statistically and is clearly comparative. The Societies of Europe is the most comprehensive data series available on Western European social issues. Each book is accompanied by a CD-ROM containing datasets not included in the text enabling users to manipulate the data as wanted. Information is available in different programmes (Excel, SPSS and SAS) and in data structures for analysing, and building time series. This data handbook and CD-ROM records the results of all legislative elections held in 18 European countries collected at the level of single constituency for the first time. The collection of results has been made completely machine-readable according to standard rules across countries, historical periods and electoral systems.