THE LIFE OF SOCRATESYear: 1949Price: £5Number in set: 6ERASMUSYear: 1950Price: £5Number in set: 6MERCATOR, BELGIAN THINKERYear: 1952Price: £4.5Number in set: 6ARCHIMEDES, FAMOUS THINKERYear: 1953Price: £4Number in set: 6WISE MEN OF ANTIQUITYYear: 1958Price: £3Number in set: 6PHILOSOPHERS AND SCIENTISTSYear: 1968Price: £7.5Number in set: 6