- 3291
- 1981-07-10
technology: الطاقة الشمسية
- 3255
- 1981-06-04
- 3253
- 1981-06-02
- 3252
- 1981-06-01
- 3235
- 1981-05-15
- 3234
- 1981-05-14
- 3186
- 1981-03-27
- 3185
- 1981-03-26
- 3169
- 1981-03-10
- 3147
- 1981-02-15
- 3096
- 1980-12-25
- 3094
- 1980-12-23
- 3060
- 1980-11-19
- 3050
- 1980-11-09
- 3040
- 1980-10-30
- 2986
- 1980-09-06
- 2961
- 1980-08-11
- 2949
- 1980-07-30
- 2858
- 1980-04-30
- 2856
- 1980-04-28