Judul asli : "Economics"
No Inv.: 1582-1584/BD/Perp/91/3c
No Inv.: 2456-2460/P/Perp/95/5c
No Inv.: 12450-12451/P/Perp/94/2c~1031-1035/P/Perp/98/5c
Judul asli : "Prelude to Revolution ..."
No Inv.: 11205-11209/P/Perp/92/5c
No Inv.: 1872-1874/P/Perp/95/3c~4281-4290/P/Perp/97/10c