I have some information that may help you, if it's still valid. I know of a Ruth and Bill(W.J.) Waldo of Seattle (last known address, up to maybe 5yrs ago, 4540-8th Ave.N.E. #1005, SEATTLE WA 98105-4739). I also have a telephone no. for them (0 01) 206-547-6177.
After some disruptions on my side of the Atlantic, a lot of losing touch with folks has gone on, so apologies if this becomes a dead end! Their address, previous to this one, was 7553-14th Ave. N.E. SEATTLEWA 98115