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Procli Diadochi Lycii Institutio Physica in London British Library Harley MS fol. r. Procli Diadochi Lycii Institutio Physica ed Ritzenfeld Leipzig in London British Library Harley MS fol Procli Diadochi Lycii Institutio Physica ed Ritzenfeld Leipzig in London British Library Harley MS fol century copy Proclus other versions