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| History and Other Aspects of Group Development | |
| History and Trends of Group Works and Current Trends | |
| Uses of Groups Before 1900 | |
| Growth of Group Work: 1900 to the Present | |
| 1900 to 1909 | |
| 1910 to 1919 | |
| 1920 to 1929 | |
| 1930 to 1939 | |
| 1940 to 1949 | |
| 1950 to 1959 | |
| 1960 to 1969 |