Columbia subject headings:
Communication devices for people with disabilities--Data processing--Congresses.
People with disabilities--Services for--Data processing--Congresses.
Self-help devices for people with disabilities--Data processing--Congresses.
Harvard subject headings:
Princeton subject headings:
Microcomputers--Congresses.
Microprocessors--Congresses.
Minicomputers--Congresses.
People with disabilities--Congresses.
Self-help devices for people with disabilities--Congresses.