I discovered the color grassy knoll Rickerby photo on a photo archive website in 1998. I let his widow know about the photo, but she did not believe me when I told her it was an unknown, unpublished photo. She contacted the owner of the website, and she was upset at him when he told her that he no longer had the negative of the photo.
The discovery was credited in error to John Woods in Trask's boook. Woods learned of the existence from me of the photo.