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Adelung-1793: Vulkan
Brockhaus-1809: Vulkan
Brockhaus-1911: Vulkan [2] · Vulkan
DamenConvLex-1834: Vulkan
Herder-1854: Vulkan
Meyers-1905: Vulkān [2] · Vulkān [1]
Pierer-1857: Vulkan