Judul asli : "Advice to a Young Scientist"
No Inv.: 722-728/S/Perp/98/7c
No Inv.: 1543/S/Perp/91/1c~2777-2778/P/Perp/91/2c~5214-5218/P/Perp/97/5c~834/S/Perp/98/1c
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No Inv.: 2640-2649/P/98/10c