1. Institute of Latvian History, University of Latvia, Kalpaka bulvāris 4, Rīga LV-1050, Latvia ; ; ; ; ;
2. Museum of Cultural History, University of Oslo, PO Box 6762, St Olavs plass 0130 Oslo, Norway []
3. Department of Archaeology and Cultural History, NTNU University Museum, 7491 Trondheim, Norway []
4. Faculty of History and Philosophy, University of Latvia, Aspazijas bulvāris 5, LV-1050, Latvia []
5. Departments of Analytical and Physical Chemistry, University of Latvia, Jelgavas iela 1, Rīga, LV-1004, Latvia [
6. Institute of Chemical Physics, University of Latvia, Jelgavas iela 1, Rīga, LV-1004, Latvia []
7. Faculty of Geography and Earth Sciences, University of Latvia, Jelgavas iela 1, Rīga, LV-1004, Latvia []
8. Terra Topo, Piedrujas iela 3, LV-1073, Rīga LV-1073, Latvia []
9. Sperre Baltic Ltd., Biķernieku iela 18, Rīga LV-1039, Latvia []