Russian standards PDF
Occupational safety standards system. Respiratory protective devices. Gas filters and combined filters. General technical requirements. Test methods. Marking
Document status: Replaced by GOST 12.4.235-2019
Reprography. Micrography. Microforms of archival documents. General specifications
Document status: Withdrawn
Reprography. Micrography. Microforms with photoplastic films. General technical requirements and methods of control
Document status: Active
Reprography. Micrography. Symbols and stencils. General requirements
Document status: Active