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2. Tabulation and Analysis of the Results of X-ray Examinations of Edentulous Mouths;Cheppe;Northwestern Univ. D. Res. & Grad. Quart. Bull., Winter Quarter,1936
3. Practical Oral Surgery;Clark,1959
4. Statistics Obtained by Clinical and Roentgenographic Examinations of 500 Edentulous and Partially Edentulous Mouths;Cook;Dental Cosmos,1927