However, despite all the documents I have for my property, along with assessor/auditor internet resources, I am having a difficult time finding a map which accurately depicts my property line.

I do have a relationship with my credit union here but I've been so caught up in internet research I forgot about local.

You should check the laws in your town as some areas you can only increase by a certain %. you can do some research and find this on the internet.

Oh the joys of the internet and people with too much time on their hands.

They did not have cable or internet except on 1 phone. 

These people are on the internet somewhere so reach out and try to make a ton of friends until you find success!

@Lydia Bolling most of the hard work can be done anywhere you have an internet connection so your lunch hour and after the kids go to bed are perfect times to do research, if you don't have enough time maybe the solution is to narrow the search so that you have less properties to sift through

You could simply Google it and pull one off the internet that matches your scenario.

In the meantime, you can get credible education on the internet.  

Have websites up, doing direct marketing campaigns  and internet marketing w/ PPC, and spending money on education; real estate agent course, a lot of books (also bigger pockets books).