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Hans (2014) crocus [photo] Retrieved on 2017, March 23 from https://pixabay.com/es/azafr%C3%A1n-flor-primavera-buhen-318293/
PokRie (2016) beach [photo] Retrieved on 2017, March 23 from https://pixabay.com/es/playa-arena-oc%C3%A9ano-el-agua-1641791/
Giani (2012) tree [photo] Retrieved on 2017, March 23 from https://pixabay.com/es/%C3%A1rbol-oto%C3%B1o-colores-de-oto%C3%B1o-99852/
LarisaK (2012) Winter [photo] Retrieved on 2017. March 23 from https://pixabay.com/es/invierno-naturaleza-temporada-20234/