Sikora M. Informational Support of Civilian Intelligence for Heavy Industry (Including Machine Industry) and the Energy Sector in the Polish People’s Republic in the Years 1970–1990. sho [Internet]. 2019 Jun. 6 [cited 2024 Nov. 21];36:143-7. Available from: https://pressto.amu.edu.pl/index.php/sho/article/view/29098