I was visiting a long time friend and we were talking about P-38's. He pulled out this manual on the P-38 flight operating instructions and it had some interesting autographs. It was signed by Clarence, Kelly Johnson, Ben, Kelsey, and Tony LeVier. He said he was at a conference in the late 60s and early 70s about P 38, and the three were there giving talks. Afterward, he was able to take his manual that he brought with him and got all three to autograph it. Pretty cool!!!