Huz A.M; Zhevelieva I.S; Solodka O.M; Tugarova O.K; Shepeta O.V; Harasym P. S. MAIN STAGES OF ESTABLISHMENT OF THE SYSTEM OF PROTECTION OF STATE SECRETS IN POLAND IN THE SECOND HALF OF THE 20th CENTURY – IN THE FIRST HALF OF THE 21st CENTURY: HISTORICAL AND LEGAL ANALYSIS. Elementary Education Online 2023, 20, 4223-4228.