Columbia subject headings:
Harvard subject headings:
Living alone--United States.
Loneliness
Loneliness--United States.
Older men--United States.
Single men--United States.
Widowers--United States--Life skills guides.
Princeton subject headings:
Living alone--United States.
Loneliness.
Older men--United States.
Single men--United States.
Widowers--United States--Life skills guides.