- 2952
- 1980-08-02
education: البحث العلمي
- 2934
- 1980-07-15
- 2923
- 1980-07-04
- 2920
- 1980-07-01
- 2916
- 1980-06-27
- 2911
- 1980-06-22
- 2910
- 1980-06-21
- 2908
- 1980-06-19
- 2901
- 1980-06-12
- 2897
- 1980-06-08
- 2895
- 1980-06-06
- 2892
- 1980-06-03
- 2890
- 1980-06-01
- 2883
- 1980-05-25
- 2868
- 1980-05-10
- 2861
- 1980-05-03
- 2856
- 1980-04-28
- 2855
- 1980-04-27
- 2853
- 1980-04-25
- 2852
- 1980-04-24