MASS11 <=> troff

[howell%community-chest.mitre.org at gateway.mitre.org]

I'm interested in any software that performs translation between
files in MASS11 format (a text formatting system we use on PCs) and
troff format files. 

Thanks for any help,
 
     Chuck Howell
     The MITRE Corporation, Mail Stop Z645
     7525 Colshire Drive, McLean, VA 22102
     NET:  howell at mitre.arpa or 
           howell%community-chest.mitre.org at gateway.mitre.org