I've already addressed both Oldham and Wallace. You suggested that there were others. I'm asking for their names.
How many experiments confirming the radius of the earth using one specific river bed do you want? If you had
one single valid study that confirmed the earth was flat you'd be shouting it from the roof-tops. No such thing exists. You are making asymmetrical demands.
These papers are incredibly old and hard to come by, I only know of 2 confirmed studies on the topic, namely those by Wallace and Oldham. Outside of FE circles this was not an interesting experiment, so how many times should it be repeated? Wallace even predicted the radius of the earth before it was known to such accuracy. Did the global earth conspirators based their earth diameter on Wallace's measurements?