Netherlands B33-B36 CTO

Netherlands B 33-B36, canceled to order, $8.75. Michel 218-221, Euros 10.00. Child Welfare Societies, 1928. Jean Pierre Minckelers, inventor of illuminating gas; Hermann Boerhaave, medicine; Hendrick Antoon Lorentz, Nobel prize in physics 1902; Christian Huygens, mathematician, astronomer, physicist and horologist.