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- Letter from Harold Varmus to David W. Kingsbury, St. Jude Children's Research Hospital2
- Classification of posterior cervical screw systems: small entity compliance guide : guidance for industry and Food and Drug Administration staff1
- Classification of the animal kingdom: a lecture introductory to the course of anatomy, in the Philadelphia School of Anatomy1
- Cuvierian classification of animated nature: an address delivered before the Central Massachusetts Dental Association, Worcester, Mass., May 1, 18661
- De novo classification process (evaluation of automatic class III designation): guidance for industry and Food and Drug Administration staff1
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