Blekhman's works were related to postal history and postage stamps of Tuva, Mongolia, Russia and Soviet Union. He also wrote works about airmail. Blekhman participated in prestigious national and international philatelic exhibitions. He won a number of top awards. One of his main philatelic writings was a detailed study of Tuva stamps and their cataloging. This work won a major award at the World Stamp Exhibition "PRAGA 1962". After Blekhman's death, it was translated and published in English.