Thanks Matt. Yes, the palm prints first appeared in Meier's 1937 book "Lion's Paws - The Story of Famous Hands."
Dr. Jantz used the palm prints to measure Earhart's "2-4 Digit Ratio." (You can Google it.)
"There is now a fairly extensive literature that makes the case that it marks the level of prenatal sex steroids. Males have a lower ratio because of higher prenatal testosterone. The palm print of AE has the male pattern, digit 4 longer than 2. It is not the best palm print you could hope to have, but the greater length of digit 4 is pretty obvious. So I think that what it implies about her prenatal hormonal environment could also explain both her behavior and a skeleton that deceived Hoodless."
He ultimately decided not to address her digit ration in his 2018 paper.