Mike D.,

In the late 1980's, the Cartographics Laboratory of the Department of Geography
in the College of Geosciences at Texas A&M University produced an atlas,
covering the state with 78 large maps. The data were adapted from the county
maps published by the Texas Department of Highways and Public Transportation
(now the Texas Department of Transportation). This atlas was published in 1988
by Shearer Publishing in Fredericksburg, Texas, as THE ROADS OF TEXAS.

This legend of this atlas shows two different cultures for survey markers: (1) a
square for "Boundary Monument"; and (2) a triangle for "Triangulation Station."
I have examined all likely suspects in this atlas, and have found the county
quadripoints listed below marked by one or the other, usually by a "Boundary
Monument." The four marked by "Triangulation Stations" are indicated below with
"[TS]." All 13 of these points are within the northwestern quadrant of Texas.
They are also shown on the attached map. All other Texas county quadripoints
are shown in this atlas without any markings indicated.

Dallam-Hartley-Moore-Sherman
Deaf Smith-Oldham-Potter-Randall
Armstrong-Carson-Potter-Randall (Note 1)
Bailey-Cochran-Hockley-Lamb
Hale-Hockley-Lamb-Lubbock (Note 2)
Crosby-Floyd-Hale-Lubbock [TS] (Note 3)
Crosby-Dickens-Floyd-Motley [TS]
Cottle-Dickens-King-Motley (Note 4)
Cochran-Hockley-Terry-Yoakum
Hockley-Lubbock-Lynn-Terry [TS]
Crosby-Garza-Lubbock-Lynn [TS] (Note 2)
Crosby-Dickens-Garza-Kent (Note 2)
Baylor-Haskell-Knox-Throckmorton (Note 2)

Note 1. Near US 287.
Note 2. Beside local road.
Note 3. Near local road.
Note 4. Near FM 2569.

One caveat: It is possible that some of these could be a pair of tripoints
instead of single quadripoint (where the offset between tripoints is too fine to
be discerned on the maps), with one or both of the tripoints marked. Of course,
that is possible on practically any map, whether it purports to show boundary
marks or not.

As for the Borden-Dawson-Howard-Martin quadripoint that started this discussion
(which you picked for the six letters in each county name), it is not shown as
marked in the atlas. The Borden-Howard boundary is well supplied with 16 line
monuments and one tripoint monument at its eastern terminus (a pair of
doubly-monumented tripoints about a quarter-mile apart). Many of these
Borden-Howard monuments are at one-mile intervals, but there are skips, and
there are none shown in the westernmost five miles. Only three monuments are
shown on the Howard-Martin boundary, none anywhere near the quadripoint.
Borden-Dawson and Dawson-Martin are shown entirely innocent of monumentation. I
realize that does not prove the negative.

I hope that this is helpful.

Lowell G. McManus
Leesville, Louisiana, USA