TY  - BOOK
AU  - Hay, William Howard
AU  - Smith, Esther L.
TI  - Hay system of child development: William Howard Hay and Esther L. Smith
U1  - 305.231 
PY  - 1936///
CY  - London
PB  - George G. Harrap
KW  - Medicine
KW  - Smith, Esther L
KW  - Diseases of childhood
KW  - Pediatrics
ER  -