How about:
Marischal subector in _A Traveller's Guide to the Marischal Subsector_
(no date) which provides a subsector map and UWPs.  The subsector is
described as "between the large and important Wing III and Davisen"
subsectors.

As for periodical material, this is more difficult because a) my
holdings are incomplete and b) my bibliography work on what I do have
is incomplete (in particular a lot of Freelance Traveller and Stellar
Reaches to go), but here's what I've got so far.  (I should also note
that my work wouldn't pick up on *mentions* of subsectors as you note
in the query, but only where I'm aware there are maps/UWPs.)

Orion subsector - Alien Star 2 (1981), UWPs   (located where Gazulin,
D of Trojan Reach is now)

Anniversary subsector - Alien Star 5 (1981), map and UWPs (coreward of
Orion subsector - see above)

Compact Space (partial map at the subsector level) - Valkyrie 1.2
(1994).  From C.J. Cherryh's Chanur series.

Hrigli subsector - Morgonstjärnen 2 (1982/3ish?) - map and UWPs.
Hrigli is coreward of Utge.

Utge subsector - Morgonstjärnen 4 (1983?) - map and UWPs

(I would bet money that there's other subsectors in Morgonstjärnen 1,
3 & 5/6 as well but I've never seen anything of this Swedish fanzine
except #4).

I assume you don't mean 'unofficial' subsectors such as Izh Kriezhlal
subsector of Yiklerzdanzh sector

Are you familiar with: Adventuring in the Shattered Imperium - Voyages
7 (1989) with its sector map of the Third Imperium and Surrounding
Sectors highlighting sectors and subsectors that have data listings,
in which publication those listings appear, and whether they’re
official or unofficial?

Don't know if any of that helps.

tc

On 2 January 2017 at 03:24, Graham Donald (via tml list)
<xxxxxx@simplelists.com> wrote:
> This is an attempt to satisfy a point of interest, aside from Gary
> Pilkington's Precipice Subsector (Disappearance on  Aramat) and John M.
> Fords Pesek Subsector (Mentioned in the scenario Geria Transfer, published
> in JTAS10, but not to my knowledge published complete.) have there been any
> other subsectors published that are not tied to a specific sector?
>
> I have vague memories of a magazine publishing one where they used names
> from well known science fiction stories for the systems. 1987 is the cut off
> date as the setting had more or less become 'fixed' by the release of
> MegaTraveller (The last orphaned world 'Indeep' created by John M. Ford was
> published just after the release of MegaTraveller in Challenge 32.)
>
> What I am interested in is the subsector name and the source.
>
> Graham
>
>
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