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Nichols Eugene D, Garland E Henry, . (1968). Modern trigonometry. New York, USA: Holt, Rinehart and Winston.
Nichols Eugene D, Garland E Henry, . 1968. Modern trigonometry. New York, USA: Holt, Rinehart and Winston.
Nichols Eugene D, Garland E Henry, . Modern trigonometry. New York, USA: Holt, Rinehart and Winston. 1968.
