Correlation of upper Llandovery-lower Wenlock bentonites in the När (Gotland, Sweden) and Ventspils (Latvia) drill cores: role of volcanic ash clouds and shelf sea currents in determining areal distribution of bentoniteKiipli, Tarmo; Kallaste, Toivo; Nestor, Viiu-KaiEstonian journal of earth sciences2012 / p. 295-306 : ill https://www.researchgate.net/publication/259465427_Correlation_of_upper_Llandovery-lower_Wenlock_bentonites_in_the_Nar_Gotland_Sweden_and_Ventspils_Latvia_drill_cores_Role_of_volcanic_ash_clouds_and_shelf_sea_currents_in_determining_areal_distribution Plywood reinforced with volcanic fibre fabricKattamanchi, Tanuj; Kallakas, Heikko; Hakonen, Joonas Lauri; Lõhmus, RünnoBaltic Polymer Symposium 2025 : 23d International Scientific Conference BPS 2025“Baltic Polymer Symposium 2025” : Book of abstracts2025 / p. 80 http://woodval.taltech.ee/wp-content/uploads/2025/07/BPS2025-Book-of-abstracts.pdf