I came across both of these lines while researching the alleged Mason-Dixon line markers in NJ (as far as I know, there are none). There was supposed to be a marker on LBI somewhere and even one on the Turnpike. I emailed the Turnpike commission and they said there may be some of the East/West Jersey markers nearby, but they have never heard of Mason-Dixon ones. I'm trying to find out why this story keeps insisting; the M-D officially doesn't even touch the state.
http://westjersey.org/mdline.htm
Stu, i just came across this, i do not know if you have seen this.