Ancestry has free trials where you can really dig down into your family tree for up to two weeks. That’s more than long enough for an exhaustive search if you’re dedicated. It’s a lot of fun and you’d be really surprised at how far you can go back and the history you can put together. You’ll also be connected to a number of your relatives who also use the service. If the marriage and birth records don’t help you out, no doubt some of your distant relatives may be able to.

I will say it’s unfortunate there weren’t notes on the backs of the photos. I thought everyone from the pre-digital world did that. Maybe I just got lucky.