Here are entered works of a predominantly religious nature discussing 20th century problems and prospects of Islam and desirable changes, including works that advocate a civilization or society based on the teachings of Islam. Works on the medieval civilization of the Middle East, North Africa and Arab Spain collectively are entered under [Islamic civilization.] Works on the civilization of the Arab countries for all periods, or for the pre-Islamic or modern periods only, are entered under [Civilization, Arab.] Works on the civilization of the Islamic countries for all periods, or for the pre-Islamic or modern periods only, as well as non-Islamic culture during the medieval period, are entered under [Islamic countries--Civilization.]