1986 Ford Bronco Vehicle is leaking coolant

My 1986 Ford Bronco is still running fine with over 210, 00 miles on it. Knock on wood. Probably thanks to the regular use of Duralube since birth. Hey!
I like the car, plus I'm a disabled person, and my budget is low is why I put in money for repairs; and sign on to ask this question. But all that is beside the point.
A seemingly small cooling fluid leak has recently developed in the vehicle. The slow loss of fluid does cause moderate overheating on moderately long drives. I'd estimate I'm losing a 3 to 4 quarts somehow, and somewhere along the way. It sure is limiting my ability to get my necessaries done.
I have turned on and ran the vehicle for a mile or two, to right back home in an attempt to discern the source of the leak; as, of course, a simple hose replacement would be no great problem.
However; the hoses appear ok. I feel nor see any fluid on them, in areas around them, and/or at each C-clamp junction. The leak doesn't gather up front with the radiator assembly. It appears to be, maybe, 1-2 feet back, and is dripping off the undercarriage. I can't see in particular where it is arising from.
Could anyone tell me what might be the trouble and/or source of the leak? If it is a big repair, I probably won't be able to fix it myself, but at least I'll have a heads up, and be at less of a disadvantage, when I take it to a mechanic.
Thanks. Help!