Its on the Mosquito web page 21 January German Jet Encounters
In this case it helps to know the author. Norm Malayney famously made two version of all of his notes. The first was complete and as accurate as he could make it; the second had intentionally altered facts. He maked both copies as "copyrighted," but only circulated the doctored version - and he widely circulated that version! Then, when other authors (particularly Martin Bowman) used his materials without his permission, Norm could write lengthy reviews exposing the many errors that these authors had published. Norm himslef wrote a pretty decent book on the 25th BG (which includes stories about Chipman), but I don't trust ANYTHING he wrote on line or the many stacks of paper hesent me for review.
The rest of us will spend decades fixing the many errors Norm circulated, and we will never undo all the damage.
Cheers,
Dana