1920's / 1930's - The Rise of A/V (1 ene 1920 año – 31 dic 1939 año)
Descripción:
This decade saw the rise of the radio and audio movement - which over the next two decades ultimately had little impact on facilitating instruction.Añadido al timeline:
fecha:
1 ene 1920 año
31 dic 1939 año
~ 20 years