Part I (1978), covers the period from 1917 to 1947;

Part II (1979), covers 1947 to 1977;

Part III (1984), covers 1978 to 1983;

Part IV (1990), covers 1984 to 1988;

covers 1989 – 2000.

Part V (2014)

The study was published in five parts so far, covering the period 1917 to 2000, published at different times.

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