| Notas: | A la cabeza de la portada: ISBN 0191-913X--Second revision--"Revision of a paper presented at the First Annual Census Bureau Research Conference, march 20-23, 1985, Sheraton International Conference Center, Reston, VA Joel E. Cohen provided helpful references and suggestions on an earlier version. Preparation of the manuscript was supported in part by National Science Foundation Grant Number SES-8218817 and in part by the IC Institute, The Univesity of Texas at Austin. Hower, the conclusions expressed herein do not necessarily represent the opinions of the sponsoring organization" |
|---|