https://www.variantes.com/livres-jeu-echecs-tournois-anglais/58108-alexander-alekhine-the-russian-sphinx-volume-i-1892-1921-hardcover-voronkov--9785604560792.html
Alexander Alekhine - The Russian Sphinx : Volume I Hardcover Elk and Ruby - Voronkov - Boutique...
Chess-wise, Voronkov presents over 50 games and fragments with original commentary by Alekhine and his opponents, most of which has not been published in books...