1947
Airmail – Juan de Velasco and Riobamba Irrigation Canal


[Airmail - Juan de Velasco and Riobamba Irrigation Canal, type UW]


[Airmail - Juan de Velasco and Riobamba Irrigation Canal, type UX]


[Airmail - Juan de Velasco and Riobamba Irrigation Canal, type UY]


[Airmail - Juan de Velasco and Riobamba Irrigation Canal, type UZ]


[Airmail - Juan de Velasco and Riobamba Irrigation Canal, type VA]


[Airmail - Juan de Velasco and Riobamba Irrigation Canal, type VB]


[Airmail - Juan de Velasco and Riobamba Irrigation Canal, type VC]

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