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- [2] CERTIFICATION REQUIREMENTS FOR SCHOOL PERSONNEL IN THE UNITED-STATES - NATL-EDUC-ASSOC PEABODY JOURNAL OF EDUCATION, 1962, 40 (02): : 123 - 123
- [5] CERTIFICATION OF SCHOOL ADMINISTRATORS IN THE UNITED STATES SCHOOL AND SOCIETY, 1937, 45 (1171): : 784 - 786
- [6] UNITED-STATES PATENT REQUIREMENTS IN VITRO-JOURNAL OF THE TISSUE CULTURE ASSOCIATION, 1981, 17 (12): : 1084 - 1085
- [9] LIABILITY OF UNITED-STATES FOR UNWARRANTED CERTIFICATION OF AIRCRAFT FORUM-AMERICAN BAR ASSOCIATION, 1976, 11 (02): : 574 - 589
- [10] EDUCATION AND CERTIFICATION OF ORTHOPAEDIC SURGEONS IN THE UNITED-STATES JOURNAL OF BONE AND JOINT SURGERY, 1947, 29 (01): : 1 - 5