- Medici, Fabrizio de'2
- Medicine--Formulae, receipts, prescriptions2
- Middle East--Jerusalem2
- Military art and science2
- Moral conditions2
- Municipal government2
- Naples (Kingdom)2
- Naval history2
- Navigation2
- Oaths2
- Orden de Santiago2
- Orders of knighthood and chivalry2
- Ordnance--Manufacture2
- Ospedale di San Bartolomeo (Florence, Italy)2
- Paul III, Pope, 1468-15492
- Peasant uprisings2
- Peru--Cuzco2
- Petrucci, Pandolfo, 1452-15122
- Piccolomini della Triana, Silvio, 1878-19622
- Pius V, Pope, 1504-15722