This impeccably prepared guidebook teaches us how to find ancestors on both the Maine and New Brunswick sides of the Upper Saint John River Valley, a region that ultimately became home to the indigenous Maliseets, Acadians, French-Canadians, Irish, a few Scots, and a few (mostly English) Loyalists. The extant records of the valley (found in both local and distant archives) extend from 1792 to the 20th century, and, following his historical introduction, Mr. Findlen devotes the bulk of his narrative to an inventory of them. The researcher will find separate chapters devoted to each of the following record categories: church registers (probably the most valuable of all records), vital records, marriages, cemetery records, censuses, land records, will and probate documents, newspapers, as well as the various record repositories themselves.