The stars classified here are almost all included in B. Skiff's compiilation of MK spectral classifications (B/mk). Additional notes about a few entries are added here.

LTT 3537   [Simbad]    [3537/8]

is a pair of white dwarfs LDS 275AB:
A (2MASS J09365978-3721306) is DC;
B (2MASS J09365994-3721269) is DA, at ρ=4'', θ=30°.

LTT 7512   [Simbad]    [HD 175617(B)]

There are 2 stars at 20'': one North (UCAC2 30413494) and South (LDS 659B, northest of a  10''-trio).

The southern star (2MASS J18562037-0425085) has a significant proper motion, but cannot be physically related, even though the proper motions have the same direction. Measurements from the WDS database give:

Epoch	θ(°)	ρ('')	source
1920.	225.	31.	Luyten (θ approximate only)
1954.416	196.3	27.05	USNO-A2.0
1986.651	195.8	22.46	GSC-ACT
1999.301	196.6	21.07	2MASS
1999.608	196.4	21.13	DENIS,n=2
2000.57	196.5	20.98	UCAC3
2003.230	196.3	20.79	CMC14
2005.672	196.9	20.40	UKIDSS DR6
2013.927	197.1	19.40	URAT1 (new addition)

Moreover, the radial velocities differ by 160 km/s according to Fouts (VizieR III/144), so the 2 stars simply cannot be related.

LTT 11334   [Simbad]    [Ross 22]

There is a 20min RA offset in LTT compared to the Ross 22 position: Ross indicates a 1875 position 03 36 04 +48 50.9, but in his paper ``New White Dwarfs, Subdwarfs, and Binary Stars'', Kuiper (1940ApJ....91..269K) gives a position which corresponds to a 1875 position of 03 56 04 +48 50.9, re-used by Luyten in the LTT. A further note by Kuiper mentions that van Maanen could not recover Ross 22 (1940ApJ....91..366K)

LTT 12574   [Simbad]    [type=F8f]

This entry seems to be simply a Luyten goof. It is given in the early "half-second" catalogue as LFT 673 = L 1542-26, but disappears in later Luyten catalogues with no note about the omission.

LTT 15085   [Simbad]    [Ross 1059]

Ross position coincides with SDSS J170852.33+603736.3, a blue/red double which may have generated a fiducial proper motion; but the star is not a high proper motion star.

LTT 15089   [Simbad]    [Ross 1060]

Ross position coincides with GSC 4198-123 = 2MASS J17102385+6031178, but has a small proper motion.

LTT 15091   [Simbad]    [Ross 1061]

Not a large proper motion star.

LTT 18520   [Simbad]    [Grw+83 3163]

This is not a large proper motion star. Its position corresponds to UCAC4 870-008656 (GSC 04649-1008, µ=1mas/yr). There is however a star with >0.1arcsec/yr proper motion close to this position, but not in the Astrographic Catalog: UCAC4 870-008648 (GSC 04649-2329, µ=0.118arcsec/yr, θ=123°)