Uhlenbeck had expertise in Basque, but since he retired from the university in 1926, he gave the glossaries to his post-graduate student Nicolaas Gerard Hendrik Deen.
Uhlenbeck je bio stručnjak za baskijski, ali budući da je bio u mirovini od 1926., on je dao glosare postdiplomskom studentu Nicolaasu Gerardu Hendriku Deenu.