542): the European average was 63 hours in 1870, 56.3 in 1900 and 53.8 hours in 1913 (Huberman, 2002, p.
542): den europäeschen Duerchschnëtt war 63 Stonnen am Joer 1870, 56,3 am Joer 1900 an 53,8 Stonnen am Joer 1913 (Huberman, 2002, p.