Few things enrage me as much as closed source systems do. Academic paywalls are one of them. Therefore, I made both my bachelor's thesis and the Concrete Island book itself available online through PubliDo. No payment or login required.

Concrete Island (Book), DOI: 10.26205/opus-3821
Concrete Island - Thesis und Dokumentation (Bachelor Thesis) DOI: 10.26205/opus-3820