Communist China has the largest population in the world, yet the average American knows little more than the names of Mao Tsetung and the Red Guard. The only American to ever travel virtually unrestricted throughout China is Edgar Snow. He has known Chairman Mao Tse-tung and President Chou En Lai for many years. He has seen the people of China in all phases of life. He has devoted his life to the topic of Red China, writing books such as Red Star Over China and Journey to the Beginning. Today the movements of Red China are more important than ever. For an interpretation from one of the world's foremost experts on the subject and the premier of his documentary film, "One-Fourth of Humanity," don't miss . . . SNOW ON: RED CHINA and VIET NAM presented by People-to-People 7:30 p.m. TONIGHT Hoch Auditorium