Interesting, since a couple of years earlier he was saying he didn't have many copies left:
June 8, 1961
Sorry I can only ship one copy but I am down to the end of mine. Other people have
written me that Griffith does not respond either to money or written request. I have
attempted to send copies to all those who asked for them but Griffith only sent me a
limited number. What has gone wrong up in Eureka I really don't know.
He must have tracked down Griffith and finally got more copies on 9/18/63 and sent them right out.
(Added image of third copy with the same date to post above.)