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Re: Lockdown Escape (Madness?)
From: David Iwancio
Date: 2020 Apr 27, 08:21 -0700

Flipping through HathiTrust, the "Orbit Time" table wasn't in the 1961 reprint of HO 249, but is in the 1970 reprint, with the table itself having values going back to 1965. So I'd guess sometime between 1965-1968.

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