1. U.S. Bureau of the Census, Geographical Mobility, March 1975- March 1980, Current Population Reports, ser. P-20, no. 368 (Washington, D.C., 1981), 9. [BACK]

2. U.S. Bureau of the Census, Marriage, Divorce, Widowhood, and Remarriage, Current Population Reports, ser. P-20, no. 312 (Washington, D.C., 1977), 1. [BACK]

3. Lois M. Verbrugge, "The Structure of Adult Friendship Choices," Social Forces 56 (1977): 576-97; see chap. 3, note 9. [BACK]