Volume 15 is Supplement I; it contains additional biographies as well as topical essays on non-Western scientific traditions. Volume 16 is the general index. A 2-volume Supplement II with additional biographies was published in 1990.
Volume 15 is Supplement I; it includes supplementary biographies as well as essays on non-Western scientific customs and knowledge. Volume 16 is the comprehensive reference work. A 2-volume Supplement II with extra biographical entries was released in 1990.