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BSGO are items you happen upon in your research, somewhat serendipitously, and you must follow that lead, sometimes falling into a genealogy black hole! Sometimes it pays off, sometimes it doesn’t.
1. I do stumble upon BSGO every once in awhile.
2. My most recent BSGO was while looking through unindexed record sets on FamilySearch dot org. I was looking at land records for Genesee County, NY, for the early 1800s as John Ford said his father bought land in the Holland Purchase about the time he was 7 (1815). Lo and behold, I found land sold to Nathaniel Ford by an Archibald Bennett in 1816. !!! Since I had yet to connect Prudence Bennett, Nathaniel’s wife, to anyone at all, seeing these two names together in a land transaction gave me hope! I took Archibald Bennett’s name and ran with it. I found out Archibald Bennett had applied for a Revolutionary War pension from Decatur County, IN, in 1837, one of the witnesses being John Ford (I’ve established that John Ford was in Indiana in the late 1830s). Archibald Bennett’s Rev War pension application gave his date and place of birth as being Antietam, Maryland, in 1762, and that he was recruited as a Frontier Ranger while living in Washington County, PA, during the Rev War. The year of birth, 1762, made him too young to be Prudence’s father, so I’m guessing a brother or uncle. At any rate, just finding that land record opened a lot of doors for me! I imagine I spent a good hour chasing leads.
3. If I find something promising, I go after it then and there if at all possible. If not possible, I make a note of it in Evernote or jot it down. It depends on the situation how disciplined I am about being mesmerized by BSGO. 🙂