Hi Lisa:
This is what I would do...
1) Contact a local, custom/portable sawmill owner to determine their interest in these walnut logs.
2) Contact a local timber buyer to determine their interest in these walnut logs.
Please contact your local PA-DCNR service forester for such contacts/lists:
http://www.dcnr.state.pa.us/forestry/yourwoods/serviceforesters/index.htm
Best of luck!