Here is how I use these fonts with X.  Make a directory, something like
~/fonts, or use an existing directory on your font path.  You can query your
font path with "xset q".

Create or add to fonts.alias:

dmF07		-apollo-dm-medium-r-normal--7-50-100-100-c-50-iso8859-1
dmF12		-apollo-dm-medium-r-normal--12-90-100-100-c-60-iso8859-1
dmF14		-apollo-dm-medium-r-normal--14-110-100-100-c-70-iso8859-1
dmF18		-apollo-dm-medium-r-normal--18-140-100-100-c-110-iso8859-1

Run mkfontdir to create or update fonts.dir.

Now add the directory to your font path with "xset fp+" or, if using an
existing directory, "xset fp rehash".

Test with "xfd -fn -apollo-dm-medium-r-normal--12-90-100-100-c-60-iso8859-1".
