Mark S. Mizruchi, The American Corporate Network, 1904-1974, Beverly Hills: Sage Publications, 1982, 216 pp.
Publisher's Blurb (slightly edited):
The first extended historical treatment of interlocking corporate directorates, this closely argued study provides rewarding insights into the changing structure of the American corporate elite. Mizruchi uses network analysis to find significant patterns in corporate interlock data on 167 major U.S. corporations through the first three-quarters of the twentieth century. A wide range of social scientists, historians, and business researchers will prize his insightful, methodologically sophisticated view of the structure of the corporate elite- and its implications for contemporary society.
The book is out of print, but you can order it from amazon.com.