Experience in Reconstructing the Appearance of Leningrad Industry in the Pre-War Year (June 1940 – June 1941).

This article summarizes the main findings of the author's reconstruction of Leningrad's pre-war industry (June 1940 – June 1941) conducted between 2016 and 2025. Using direct counting, the number and geographic location of all industrial enterprises, including industrial cooperatives, within the city's administrative boundaries in the pre-war year were determined. The product range was identified, and the people's commissariats and departments to which Leningrad industrial enterprises were subordinate were established. Enterprises are grouped according to their subordination, and the personnel numbers of most large and medium-sized plants and factories are ascertained. Civilian enterprises with military order programs in the pre-war period were identified, and the minimum estimated number of Leningrad manufacturers fulfilling defense orders in the pre-war year was determined. The sectoral structure of Leningrad industry is presented, enterprises are ranked by social significance, from "large" to "small," and biographical particulars are collected for the managers of large, medium, and some small enterprises (directors, party organizers/secretaries of the All-Union Communist Party (Bolsheviks), and chief engineers). The structured dataset is defined as a "model of Leningrad industry". The model's application opens up broad possibilities for studying processes and conditions both within the given time period and beyond. The model is scalable (its information capacity is unlimited), has an open architecture (it can be expanded with new criteria), and enables research over time periods extending beyond the initially defined framework