K.D. Ushinsky :
Ushinsky, K.D.
K.D. Ushinsky : selected works / K.D. Ushinsky - Moscow: Progress. 1975. - 378 p.: ill. 18 cm
LB675 / .U84 1975
K.D. Ushinsky : selected works / K.D. Ushinsky - Moscow: Progress. 1975. - 378 p.: ill. 18 cm
LB675 / .U84 1975