Inputting DEM data into GRASS

A novice question follows (apologies accompany).

I have a number of files of DEM data for different areas of NE
Australia (unfortunately not all in the same format but we'll
ignore this for the moment).

Let's take one group of files. They consist of 10201 lines of
ascii data, the fields being (separated by spaces):

Longitude Latitude Elevation (as in the following example
            records)
    146.000 19.500 320
    146.005 19.500 313

    The increment in LAT and LONG between data points is 0.005
    degrees.

My question:

    What is the best way to import this data into a GRASS
    mapset? Is my only option to convert the data to a
    format suitable for r.in.ascii?

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