9th GR: Medieval World Investigation

Dictionary of the Middle Ages by Joseph R. Strayer (Editor); American Council of Learned Societies Staff (Contribution by)

Encyclopedia of Islam and the Muslim World (2 volumes) by Richard C. Martin

Encyclopedia of the Middle Ages by Norman F. Cantor (Editor); Harold Rabinowitz (Editor)

Encyclopedia of World Biography 2 17v + Sup 18-23 by Gale Research Inc

Exploring the Middle Ages by Marshall Cavendish Corporation Staff (Contribution by)

Handbook to Life in the Medieval World (3 volumes) by Linda G. Jones; Madeleine Pelner Cosman

Medieval Islamic Civilization by Josef W. Meri; Jere L. Bacharach

Medieval Islamic Civilization (2 volumes) by Josef W. Meri; Jere L. Bacharach

Medieval Jewish Civilization by Norman Roth (Editor)

Middle Ages - Biographies (2 volumes) by Judson Knight; Judy Galens (Editor)

Middle Ages Reference Library by Judson Knight; Judy Galens

World Monarchies and Dynasties (3 volumes) by John Middleton