[Soldiers in trench with cannon, Tai'erzhuang, Xuzhou front, China]

[Soldiers and peasants tending to the wounded, Tai'erzhuang, Xuzhou front, China]

[Aftermath of the Battle of Tai'erzhuang, China]

[Grave markers, Tai'erzhuang, Xuzhou front, China]

[Man helping female with grenades attached to her uniform, Tai'erzhuang, Xuzhou front, China]

[Aftermath of the Battle of Tai'erzhuang, Xuzhou front, China]

[Aftermath of the Battle of Tai'erzhuang, Xuzhou front, China]

[Soldiers in training, Tai'erzhuang, Xuzhou front, China]

[Collage of two prints of explosion in the mountainside, Rio Segre, Aragón front, near Fraga, Spain]

[Republican soldiers in cloud of dust, Rio Segre, Aragón front, near Fraga, Spain]

[Republican soldiers in cloud of dust, Rio Segre, Aragón front, near Fraga, Spain]

[Wounded Republican soldier in stretcher surrounded by comrades, Rio Segre, Aragón front, near Fraga, Spain]

[The battalion's political commissar and commander, Rio Segre, Aragón front, near Fraga, Spain]

[Republican soldier carrying wounded comrade on his back, Rio Segre, Aragón front, near Fraga, Spain]

[Soldiers with donkeys transporting munitions over a wooden bridge, Río Segre, Aragón front, near Fraga, Spain]

[Republican soldiers storming forward, Rio Segre, Aragón front, near Fraga, Spain]

[Young girl at refugee transit center, Barcelona]

[Leon Trotsky lecturing Danish students on the history of the Russian Revolution, Copenhagen]

[Man pushing cart through muddy tracks, Saarland, France]

[Armored train, near the Xuzhou front, China]

[Workers, who favored Saarland's reunification with Germany, with tractor, Saarland, France]

[Couple hoping to break into the movies performing at the Ciné Crochet before a film camera and an audience, Paris]

[Man looking at political posters before the national election that would put into power the leftist-liberal Popular Front coalition government, Paris]

[Workers during the period of sit-in strikes, Paris]