III · Science
The master plan study for the development of science and mathematics in the primary and secondary levels in the Democratic Socialist Republic of Sri Lanka
Subjects
Science · Study and teaching (Primary) · Study and teaching (Secondary) · Mathematics
Language
ENG
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![Cover of [William Wheeler Hubbell, authorized to apply for patents.] by United States. Congress. Senate. Committee on Patents](/img/cover/10200621-M.jpg)
