Direct link to paper:
"Food flows between counties in the United States"
Xiaowen Lin, Paul J Ruess, Landon Marston and Megan Konar
Published 26 July 2019. Environmental Research Letters.
https://iopscience.iop.org/article/10.1088/1748-9326/ab29ae
(Original link and title from: https://www.fastcompany.com/90422553/the-first-map-of-americ...)
And the map in question:
https://iopscience.iop.org/1748-9326/14/8/084011/downloadHRF...
Viewable online (above link downloads): https://imgur.com/gallery/E7eaf7l