Page 19 - RADIOLOGÌA
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21. Sweet-William P, Rollins H. Dental radiography and




              photography, 1960, Vol. nº. 33. 1960. 3-19 p.










              22. Kells C. The X-ray in Dental Practice. J. Am Dent




              Assoc.  Vol. nº.7. 1920. 241-72 p.









































































































































































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