Periodontal disease and oral hygiene among children, United States /
Kelly, James E.,1923-
Sanchez, Marcus J.
Rockville, Md., : U.S. Health Services and Mental Health  Administration; [for sale by the Supt. of Docs., U.S. Govt. Print. Off., Washington],
1972.
Includes bibliographical references.
Pedodontia
Periodontal disease
Teeth