N.B. The email exchange below may have been edited, e.g. to remove content not essential to the main point(s) or to standardize English spelling/grammar.
I was wondering if my boss... could use [a] map... (on the page Indo-European Languages: Evolution and Locale Maps) on his blog...
The map that you cite belongs, not to the Linguistics Research Center, but to the University of Texas Library. Visit the page Perry-Castañeda Library Map Collection and click on the "Maps FAQ" link in the left margin.