Notes on business organisation, management and industrialisation made at the start of the Guided Economy which side-lined all of these disciplines in the following years.
A notebook on the Indonesian language that belonged to a Chinese-Indonesian student attending a school in Yogyakarta. Corrections have been made using a red pencil.
Notes made during geological surveys made between Karangbolong and Terowongan Ijo in the Kebumen regency thus covering large parts of the Ayah cliff at the Javanese South Coast. This type of notebook is normally used for schoolwork, but the content appears to derive from professional land surveys.