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https://www.academia.edu/6016681/Dugmore_A_J_Buckland_P_C_Church_M_J_Edwards_K_J_Lawson_I_McGovern_T_Panagiotakopulu_E_Simpson_I_A_Skidmore_P_and_Sveinbjarnard%C3%B3ttir_G_2005_The_Norse_landn%C3%A1m_on_the_North_Atlantic_islands_an_environmental_impact_assessment_Polar_Record_41_21_37