John, maybe this from the archives of this board may help, if this is the same Alvin Cobb:

http://history-sites.com/mb/cw/mocwmb/archive_index.cgi?read=4041

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Also, see this website:

Samuel COBB I and his Descendants

http://freepages.genealogy.rootsweb.com/~jrfitch/jrf/jf30093.htm

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Gay