If you have been able to trace your ancestry to several conquistadors and pobladores of Nueva Espana then this book will be of great reference to you. I ran into this book in the Fall semester of my senior year at the Jernigan Library in Kingsville, Texas. This book is in two volumes which contains short auto-bibliographies of the conquistadors and pobladores of Nueva Espana.
Diccionario Autobiografico de Conquistadores Y Pobladores de Nueva Espana. volume I & II