Arkansas Roots--born in Egypt, school in Cash and Walnut Ridge High '65

My sister, who is still in Arkansas and I (transplanted in SF, CA after a couple of years in the military) have been researching our Lamb family which is descended from William and Mary See (C, Seay) Lamb.  

We are unable to locate our GrGrandparents, John and Elizbeth Lamb after approx 1880 census in Greene County, Arkansas.  They, along with two siblings of our grandfather, seems to have dropped off the face of the earth.

Grandfather Tilden Hendrix Lamb married Emily Henrietta Manning.  They lived and died in and around Greene & Lawrence Counties. 

We are in contact with both Lamb & Manning researchers as will as many other surnames.  

Hoping to find other people connected/researching these surnames.

Glenda Lamb Samson