https://personal.lse.ac.uk/ritschl/interwargermanydata.html
Data - Deutschlands Krise und Konjunktur - Albrecht Ritschl, LSE
datadeutschlandskriseundkonjunktur
https://dbcs.rutgers.edu/all-scholars/ritschl-friedrich-wilhelm
RITSCHL, Friedrich Wilhelm
Database of Classical Scholars - The School of Arts and Sciences, Rutgers, The State University of New Jersey
friedrichwilhelm