Catherine May Bryant gathered and collected May family history and genealogy from multiple sources. With the help of Multiple people she compiled what we have today! The "May Kinfolks" book. Here are a few resources that helped compile the book!
A few of my favorite web sites to do research to compile genealogy :
(NARA) National Archives and Records Administration www.archives.gov
(LOC) Library of congress www.loc.gov
US Gen Web www.usgenweb.org
 National Genealogical Society www.ngsgenealogy.org
GENI www.geni.com
Rootsweb www.rootsweb.com