NCPUB.ORG is website by the county of Northampton that has plot plans for each section of the county. You enter your exact address and it pulls up your records.
As to matching it to your land , a survey would be best if no iron pins remain from the original subdivision. Rural areas are harder and a professional survey may be the only recourse to actually mark it.
If I can help more , please let me know. Good luck!
Dorey Real Estate