Update
Searching the SIMBAD nomenclature turns up these:
For LHA 120-N 185
LHA 120 N = Lamont-Hussey alpha, field 120: LMC, Nebula
from K.G. Henize, "Catalogues of H-alpha emission stars and nebulae in the Magellanic Clouds" (1956)
For DEM L 25
DEM = Davies, Elliot, and Meaburn, "The nebular complexes of the Large and Small Magellanic Clouds" (1976)
L = LMC
The numbers are the position of the object in their lists.
Thanks all; this has been an interesting learning experience.
And this time I really mean it, night, night.
Barry
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