A lot of records are so common that they're, quite honestly, not worth much in terms of money.
This is the case with a lot of classical-music 78s, although you never know with certain pop music 78s, LPs and 45s. The reason being that people took good care of the classical records, ensuring that lots of them survived while the opposite was often true of the popular stuff.
That does not mean the records are not valuable from a cultural or even entertainment point of view and some disks are worth serious money, like PaulUK said.
A good place to get some answers would be at the Usenet group rec.antiques.radio+phono which is also a good haunt for those of us who like old gramophones and radios (and now even TV sets) and test equipment.
Joe, if you can list some artists there, someone might be able to steer you in the right direction.
An eclectic bunch of folks...just like here.
Whatever you do, Joe, don't put the disks out in the garbage. Then the stuff will be lost forever!
(I've found piles of records people have thrown out...including stuff I've been looking for years!