The Researcher’s Guide to American Genealogy. By Val D. Greenwood. Published by Genealogical Publishing Co., Inc.; 3600 Clipper Mill Road; Suite 229; Baltimore, MD 21211;  http://www.genealogical.com/ ; 2017. ISBN 978-0-8063-2066-3. Paperback, $59.95. “Read Greenwood from cover to cover—several times or until you feel you have well learned its content” - Elizabeth Shown Mills Elizabeth Shown Mills' advice is for genealogists making the transition from genealogy as a hobby  to genealogy as a profession.  However, I believe it is good advice for all genealogists – beginning as well as seasoned professionals.   The Researcher’s Guide is both a textbook and a reference manual. The topics range from planning research to detailed explanations of various records; how to find them and how to use them.  It was first published in 1973, and Greenwood has updated and kept it current over the ensuing forty years.  At first glance, its 738 pages seem daunting, but it is ve