1. I. V. Zaboeva, S. V. Belyaev, V. A. Popov, State Soil Map of the Soviet Union, 1: 1 M Scale. Map Sheet Q-40 (Pechora), (Izd. Akad. Nauk SSSR, 1982) [in Russian].
2. I. V. Zaboeva, Soils and Land Resources of the Komi Autonomous Soviet Socialist Republic (Komi Knizhn. Izd., Syktyvkar, 1975) [in Russian].
3. Methodological Recommendations on Delineation of Degraded and Contaminated Lands (Minprirody, Goskomzem, Minsel’khozprod, Moscow, 1995) [in Russian].
4. PND F (Environmental Protection Regulations) 16.1:2.21-98, Quantitative Chemical Analysis of Soils. Determination of the Content of Oil Products in Soil Sample Using a Fluorat-02 Liquid Analyzer (Moscow, 2007) [in Russian].
5. Procedure for Determining Damage from Soil Contamination by Chemical Substances (Approved by the Russian Ministry of Environment on November 18, 1993) (Minprirody, Goskomzem, Moscow, 1993) [in Russian].