There doesn't appear to be any doubt that Oscar C. Eliason is the composer of "Got Any Rivers" {"God Specializes"}.

See this index of religious songs & note that the only entry for that song is the "chorus":

Got Any Rivers ©1945 Oscar C. Eliason (Renewal 1973 Singspiration Music)

Got Any Rivers

Got any rivers you think are uncrossable?
Got any mountains you cannot tunnel through?
God specializes in things thought impossible
He does the things that others cannot do

http://www.christianeducational.org/pdf/Melodies_Of_The_Heart.pdf.