N. Zvorykin How to determine the freshness of the trail. /Zvorykin N. Kak opredelit' svezhest' sleda. Fifth Edition: All-Union Cooperative United Publishing House, 1933, 30, 2c. We have thousands of titles and often several copies of each title may be available. Please feel free to contact us for a detailed description of the copies available. SKUalbfbf1e1e4bbe1136a