Oh WOW! I've seen these somewhere . . . but that's all I can remember. Maybe ebay? national specialty??? I don't know.
Personally, I'd hang on to them. You will need to remove the cardboard on the back of them and get them properly cared for with acid free mat/backing. Cardboard is acidic and will cause damage to the print over time. You will want to mat them so that the print is NOT touching the glass if it is not too late to do that. I'm not sure if anything can be done about the water damage or not. I'd do a little research and find that out.
I'd also ask around and see if you can find some history on them. Perhaps your church sponsored a missionary who went to the Congo. Very interesting. You should play the lottery or you used up your luck. Not sure which.
But PLEASE make sure these are cared for so that they will be around for a long time. (also, I wouldn't display them in direct contact with sunlight.)