Sorry I couldn't specifically help on this chase.
I agree on the search words. I find I'll start with what I believe, hit some articles that may be related but offer other key words, try those, rinse, repeat... Even knowing the correct search word the digitizer misses the word thanks to bad inking, a fold, a tear, etc. Sometimes search in online historic papers feels like using a metal detector to find a plastic part. And yet I can't stop hunting.
I'll be feeling that online search beats the old days of just reading every issue on a microfilm viewer until I find I have to just knuckle down and read every issue anyway...
Dave Eggleston
Seattle, WA