After her stint working for Rio Bravo Oil that lasted from 1920-1927, Applin was sought after to work as a consultant to various other oil companies and did so until 1944.[1] It was then, in 1944, that Applin and her family moved to Tallahassee, Florida[2] where she worked alongside her husband at the United States Geological Survey, with the task of linking the oil fields of East Texas, across the southeaster United States, and into Florida, using micropaleontology and other methods.[6]