or download this
qwurx [shmem] ~ > xlsfonts | grep -i helvetica | grep 8859
-adobe-helvetica-bold-o-normal--10-100-75-75-p-60-iso8859-1
-adobe-helvetica-bold-o-normal--10-100-75-75-p-60-iso8859-15
-adobe-helvetica-bold-o-normal--10-100-75-75-p-60-iso8859-2
...