Continuing in the format similar to her Settlers of Colonial Calvert County, Maryland, Ms. Jourdan provides an enormously helpful aid in the research of St. Mary's families. The author gives a concise listing of abbreviated abstracts taken from probate, church records, chancery records, naturalizations, the patent books, rent rolls and major publications such as the Maryland Archives series. The information is arranged alphabetically by surname and an index to full-names and places adds to the value of this work. One should use this as the primary aid for further research of primary and secondary sources which exist for the county. This is a must-have book for genealogical research in St. Mary's County.