Thanks to technology, and perhaps due to Christianity’ s low status in our modern liberal age, there is a fantastic treasure trove of good, traditional Catholic books available for free or near- free. A thematic bibliography of the history of Christianity. You are here: Bibliography of the History of Christianity ( bgkr) Bibliography of Ancient, Medieval, and Early Modern Christian Heresy, Inquisition, and Witchcraft ( bgher). Bibliography of the Christian Middle Ages in Europe ( bgstrv). Bibliography – History, Social Sciences, and Miscellaneous ( bg).