This book is a scientific publication called "Zooplankton of the Siberian Arctic Ocean on the collections of the Russian Polar Expedition of 1900-1903", written by A.K. Linko. It was published in St. Petersburg in 1913 under the auspices of Imperial Academy of Sciences. Extended format (34 x 23 cm), soft cover. The main content of the book: Description of zooplankton: The publication is devoted to the study and description of zooplankton collected during the Russian polar expedition led by Baron E.V. Toll. The work represents an important contribution to the biology of the Arctic seas of the early 20th century. Scientific significance: The book provides data on the biological diversity of the Siberian Arctic Ocean, including the classification, morphology, and ecosystem significance of organisms. Illustrations and tables: The book contains 2 tables that help visualize scientific data. Historical context: The expedition of 1900-1903 was part of extensive scientific research of the Arctic, and this work is one of the valuable results of the expedition. This book is a rare copy of the scientific heritage of the early 20th century, which will be a valuable addition to any library or collection.