That’s not entirely accurate. There were significant rule changes within the year. Big sections of text changed or were simply removed between initial publication in 1977 and reprints in 1981.
It's also important that the last run back in the day was 1985 or '86... MT started shipping, and there was CT stock. (per Loren Wiseman)
Later, post-GDW, printings do exist... Applecline's numbers may be those from the "Big Floppy Books"...
Marc reprinted (DBA FFE) the CT line in 8.5×11" landscape, 2 LBB-page spreads on each page, Traveller in a series of volumes.
Books 1-8, Supplements 1-13, Adventures 0-12, the Games ... about 1997 or 1998.
Later, 2001, QLI got a license and produced GRIP Traveller - a packaging of the GRIP VTT with a reprint omnibus in digest size square bound of Bk 1-3, and the VTT already had the CT system package ready at install.
This year, Marc reprinted LBBs 1-3 with errata in an appendix
in 6×9", with margin marks for "check the errata"... This is the "Facsimile Edition" via PoD from DTRPG.
I don't know if those numbers include the GW printings- in 79 or 78, GW (UK - Livingston & Jackson) got permission to reprint the CT rules locally in the UK rather than import them, to avoid VAT. From what I've seen, those were sold up to about 1985, and never made the switch to CT 2E mechanics.
I know they don't include the BFBs, GRIP-Traveller, separately sold QLI Bk1-3, and the new Facsimile edition, nor the PoDs of TTB and TTA.
There's also the "clone" issue... During the late 1990s, Marc authorized cloning books... Each owner of a physical copy was permitted to make a "clone" for one other person. So, for GDW materials for CT (and only CT), someone having a photocopied one might not be a copyright infringement. Thus, there are even more copies out that are literally untrackable.
Further still, the majority of the charts and tables for CT are in an FGU released volume, The Traveller Log Book. It includes all the Bk 1 tables...