- ArchivtektonikArchiv der Basler Mission
- TektonikGuides / Findings Aids
- TektonikArchives
- TektonikE - E – Cameroon
- GliederungE-31 - Sketch Maps, plans of buildings and legal documents concerning land2
- GliederungE-31.12 - Baufragen Kamerun
- Akt(e)E-31.12.5 - Building plans by H. Köster
- Akt(e)E-31.12.6 - Building plans by H. Köster
- Akt(e)E-31.12.7 - Building plans by H. Köster
- Akt(e)E-31.12.2 - Correspondence concerning building problems
- Akt(e)E-31.12.4 - Estimates, building orders, correspondence
- Akt(e)E-31.12.1 - Folder containing mostly estimates for and a survey of furniture used in mission houses
- Akt(e)E-31.12.3 - Memoranda and correspondence on building questions
