Era
-Problems
2
16th century
1
16th century --
1
1871-1918
1
1918-1945
1
1945
1
1945 -
1
1945-
1
1950-
1
1960-1980
1
1971 -
1
1990
2
1999
1
20th century
1
Australia
1
Case studies
2
Cases
1
Examinations,questions, etc
1
Handbooks,manual,etc
1
Law and legislation --
1
Political aspects --
1
Problem,exercise etc
1
Problem,exercise,etc
1
Problems, exercises etc
1
Problems,exercise etc
1
Study and teaching
1
Study guides
3
United States
1
case studies --
1
handbooks, manuals, etc
1
stories, plots, etc
3