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Subjects: TEACHERS; EDUCATION; EDUCATORSUNITED States
Subjects: TEACHING; TEACHERS' unions; STANDARDSUNITED States
Subjects: TEACHER training; TEACHINGUNITED States
Subjects: CURRICULUM; TEACHING; EDUCATIONAL changeUNITED States
Subjects: TEACHERS; TEACHINGUNITED States
Subjects: TEACHING; EDUCATION; AGRICULTURAL collegesIOWA; UNITED States