A new edition of the classic English-language history of Korea first published in 1927. It has been extensively annotated by Bishop Rutt with reference to sources and including commentary and bibiography. It is introduced by an extensive and, to date, the only biography of Dr. Gale, a towering scholar in the early days of Western residence in Korea.
You might find second hand copies outside of Korea (some of them prohibitively expensive). Best to source this direct from the RASKB.