Judul asli : "Advice to a Young Scientist"
No Inv.: 1952-1961/P/Perp/97/10c
No Inv.: 1272-1281/P/Perp/97/10c
No Inv.: 1162-1171/P/Perp/97/10c
No Inv.: 211-220/P/Perp/97/10c
No Inv.: 2237-2246/P/Perp/97/10c
No Inv.: 6294-6297/P/Perp/92/4c
Judul asli : "Scientific Knowledge and Philosophic Thought"
No Inv.: 9236-9245/P/Perp/97/10c
No Inv.: 5092-5096/P/Perp/99/5c~117950-117952/P/Perp/09/3c