Harmonizing and publishing heterogeneous premodern manuscript metadata as Linked Open Data by Koho, M, Burrows, T, Hyvonen, E, Ikkala, E, Page, K, Ransom, L, Tuominen, J, Emery, D, Fraas, M, Heller, B, Lewis, D, Morrison, A, Porte, G, Thomson, E, Velios, A, Wijsman, H