Ushanov, S.V. and Ushanova, V.M. 2021. AGE-SPECIFIC DYNAMICS OF ESSENTIAL OIL CONTENT IN ABIES SIBIRICA BARK. THEORETICAL ASPECTS OF EVALUATION. Chemistry of plant raw material. 4 (Dec. 2021), 175-182. DOI:https://doi.org/10.14258/jcprm.2021049648.