Changbai refers to 长白山 the Changbai Mountains located in the Northeastern province of Jiling 吉林 near the North Korean border.
Young Red Guards learning about agriculture in the fields.
Print # 6 in the Appreciation of Modern Art Volume 3
Norman Bethune was a Canadian surgeon who volunteered to help the People’s Liberation Army in the 1930s. Mao held him up as a model for emulation. See an animated storybook of Norman Bethune here and another collection of storybook pages here.