The following are helpful links that will provide you with more information regarding right-of-way and other associated fields.

PA DEPT of Transportation/Agencies:

Pennsylvania Department of Transportation	Pennsylvania Turnpike Commission
Redevelopment Authority of Allegheny County	Port Authority of Allegheny County
United States of Department of Transportation	Federal Highway Administration
Federal Aviation Administration	Federal Transit Administration

Associations:

International Right-of-Way Association	American Association of State Highway and Transportation Officials
American Society of Highway Engineers	American Society of Civil Engineers
Pennsylvania Notary Association	American Society of Appraisers
Appraisal Institute