Geological map of Kuznetz coal basin.

American geological map of the Russian Kuznetsk Coal zone, published by R. Martens & Co. From New York. color key in upper
The development of the coal fields of Kuznetsk Basin, (sometimes called the "Kuzbass") transformed the Siberian steppe. The south sector of the Trans-Siberian Railway became a great industrial center because of the activity surrounding the coalfields. These ancient reserves of 13,000,000,000 tons grew to 450,658,000,000 tons. In 1937, the 50 mines in this area produced a total of 17,300,000 tones.
The coal production of this zone was comparable with that of all of British India, and half of that produced by Japan. Kuznetsk coal was the best in the USSR, with high energy and low sulphur content.
The total anthracite reserve was 54 million tons and was used in the Ural-Kuznetsk Metallurgical Combine. (source : Wikipedia)

R. Martens & Co., an English company having extensive business in Russia, in 1915 retained the firm to organize an American subsidiary, primarily to operate steamships in the transportation of freight, passengers and mail. Their "Russia Trade Corporation of America" was organized in New York in 1916. With the Russian defeat and revolution, the Russia Trade Corporation fell off and it was liquidated shortly after the war. The American Martens company was dissolved and liquidated in 1929.