Posters: Heighten Our Vigilance to Protect our National Airspace, Tigao jingti hanwei lingkong. Zhanbei jiaoyu guatu zhisa, ‘Heighten our vigilance to protect our national airspace’. Third battle preparedness education poster, 775 x 530mm., Publisher Jiefangjun huabaosh 1962 ; ‘Jun Min Lianfang Gonggu Bianjiang’ ‘Army-civilian joint defence consolidates the borders. Fourth battle preparedness education poster’, 775 x 530mm., The Pictorial of the Peoples Liberation Army of China, Publisher Jiefangjun huabaosh, 1962, with 2 others from the same series (4)