iPEHD Raw Data: Industry The codebooks in the codebooks section provide detailed information on the variables. Before accessing the data, please make sure to read the raw data and merging data sections. Number of factories 1819 (CSV, 13 KB) 1849 (CSV, 80 KB) Technology 1819 (CSV, 16 KB) 1849 (CSV, 65 KB) Transportation 1819 (CSV, 11 KB) 1849 (CSV, 13 KB) 1862 (CSV, 11 KB) You Might Also Be Interested In Artikel Welcome to iPEHD – the ifo Prussian Economic History Database Area ifo Center for the Economics of Education