I'm not sure which St. George's Society printed this (There are many societies) but you might not need that because you can get a reprint of the Relation online.
The Relation = a narrative entitled "The Relation of a Voyage unto New England begun from the Lizard, ye first of June 1607"
A reprint of the narrative is in this free online book:
"The Sagadahoc Colony, comprising the relation of a voyage into New England" by Henry Otis Thayerhttp://www.archive.org/details/sagadahoccolony00thaygoog
Note: The author of the original narrative is UNKNOWN, but Thayer believed that the author was JAMES DAVIES.
Somehow further references to this work have changed the name to JAMES DAVIS.
Also see this web page:http://davisbeantrees.home.comcast.net/~davisbeantrees/id35....