TY  - BOOK
AU  - Washton,Nathan Seymour
TI  - Teaching science in elementary and middle schools
SN  - 067930231X
AV  - LB1585 .W28
U1  - 372.3/5/044 
PY  - 1974///]
CY  - New York
PB  - D. McKay Co.
KW  - Ciencia
KW  - Estudio y enseñanzas elemental
KW  - LEMB
KW  - Science
KW  - Study and teaching (Elementary)
KW  - Local
N1  - Bibliography: p. [441]-471
ER  -