Judul asli : "Inleiding tot de Wetenschapsleer"
No Inv.: 102907/S/Perp/05/1c
No Inv.: 128999/S/Perp/10/1c
No Inv.: 102585/S/Perp/05/1c
No Inv.: 110246/S/Perp/07/1c
No Inv.: 108881-108885/P/Perp/06/5c~116375-116377/P/Perp/09/3c~135342/SM/Perp/13/1c~134524/SM/Perp/13/1c~1`35956/PH/Perp/13/1c~136648/SM/Perp/14/1c
No Inv.: 113/P/Perp/95/1c~84341/P/Perp/02/1c
No Inv.: 11025/Perp/62/1c~11006-11007/Perp/62/2c~11032/Perp/62/1c
No Inv.: 974-983/P/Perp/96/10c