The data is originally from Crow (1965) and
appears as Table 2.3 of Lange (2002).
Crow, J. F. (1965)
Problems of ascertainment in the analysis of family data.
Epidemiology and Genetics of Chronic Disease.
Public Health Service Publication 1163,
Neel J. V., Shaw M. W., Schull W. J., editors,
Department of Health, Education, and Welfare, Washington, DC,
USA.
Lange, K. (2002)
Mathematical and Statistical Methods for Genetic Analysis.
Second Edition.
Springer-Verlag: New York, USA.