Our local library here in Fairfax, Va., has a set of reference works entitled "Roster of Union Soldiers 1861-1865" edited by Janet B. Hewett (Broadfoot Pub., 1997). It lists by state those of record who served during the Civil War. There's a volume for New Jersey & it provides regiment, company, & rank of all soldiers (but not navy) from the state. I just volunteered to do lookups for my home county in Pa. & would certainly offer to do lookups for the Monmouth County listees who have been very helpful to me in finding my NJ roots. Unfortunately this work doesn't provide dates of service nor any personal info on each soldier but it might be a starting point since you need to know regt. & co. to retrieve service records from the US Archives. Please send first & last name & possible middle initial & last name spelling variations. Barbara