Eric P. Kelly, a student of Slavic culture for most of his life, wrote The Trumpeter of Krakow while teaching and studying at the University of Krakow. During five years spent in Poland he traveled with an American relief unit among the Poles who were driven out of the Ukraine in 1920, directed a supply train at the time of the war with the Soviets, and studied and visited many places in the country he came to love so well. A newspaperman in his native Massachusetts in younger days, Mr. Kelly later wrote many magazine articles and several books for young people. He died in 1960. Less