For what purpose was the U.S census office reinterpreting a foreign census? My hunch is that spoken Rusyn and western Ukrainian are closely related. For example my father learned Polish at home from his mother, he was a Pennsylvania coal miner and understood Rusyn after working 18 years underground. I remember him saying that the Rusyn's did not like to be referred to as Ukrainians. If he were alive today he would understand this discussion.  

Dr. Franklin please cite a reliable source from the Cold War era on this Rusyn and Ukrainian dispute we are having.  Here in New York the local Rusyns and Ukrainians are happy like peas in a pod  see Ukrainian Americans in New York City. If you are in NY drop me a line and we can have lunch there. Regards