[Volunteers of the International Brigade marching through the streets of Barcelona, Spain]

[Refugees standing by the road from Barcelona at the French border, Spain]

[Refugees walking on the road from Barcelona at the French border, Spain]

[Refugees walking on the road from Barcelona to the French border, Spain]

[Downed German Heinkel plane on display on Passeig de Gracia, Barcelona]

[Downed German Heinkel plane on display on Passeig de Gracia, Barcelona]

[Young woman writing a letter on a suitcase at a refugee center, Montjuich, Barcelona]