I have the death certificates of Dick Voynow and Min Leibrook. Voynow died in 1944 and Leibrook in 1943 and both are in Forest Lawn Cemetery in Glendale, California. I posted a copy of one of their death certs, Voynow's, in a post here a couple of years ago.
Voynow's record collection partially ended up in local 2nd hand book stores in the Los Angeles area. Years ago Tim was searching a used book store in Pasadena, California and he found a Columbia Modern Music album set of Concerto In F and on the inside front cover was written in pencil "property of Dick Voynow". The album did not have all the 78's in the set. It was minus one or 2 of the 78's.
Another local collector is said to have found a similar album of 78s with the same "property of Dick Voynow" written in pencil on the inside front cover.