Bibliographic querry system?

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

We are looking for a bibliographic querry system to run on a Sun.  We are
already using refer in conjunction with troff; compatibility would be
highly desirable.

We would like to have a capability for logical operations on search terms.
We would also like a user-friendly interface for non-librarians.  The
system would be used to locate papers, memos, letters, etc. in a
research project collection.

Suggestions based on favorable experience would be very much
appreciated.  Please respond directly; I'm not a subscriber to
info-unix.

Sincerely,
 
- Marshall D. Abrams, phone: (703) 883-6938
   The MITRE Corporation, 7525 Colshire Drive
   Mail Stop Z670, Mc Lean, VA   22102
   Alternate e-mail address: abrams at mitre.arpa