1265 Johann Christian KALCKHOFF. Dissertationem de transmutatione metallorum, in illustri Academia Erfurtina, pro licentia summos in arte medica honores et privilegia doctoralia rite capessendi Caspar Cramer... respondente Johanne Christiano Kalckhoff... submittet... 4° Erfurti: literis Kirschianis [1675] Ferguson Nat Union Cat