HSR 6 (1981)
For 1981, the following issues are freely accessible:
- HSR-Volume 6.4 (1981). Mixed Issue
- HSR-Volume 6.3 (1981). Mixed Issue
- HSR-Volume 6.2 (1981). Mixed Issue
- HSR-Volume 6.1 (1981). Mixed Issue
For 1981, the following issues are freely accessible: