TY  - BOOK
AU  - Harvold, Egil P., 1912-
TI  - The activator in interceptive orthodontics
SN  - 801620945
AV  - RK 521 .H35 1974 
PY  - 1974///
CY  - [Place of publication not identifed]
PB  - [publisher not identified]
N1  - The activator in interceptive orthodontics, The
ER  -