James B. McDonald and Anand Mantrala, "The Distribution of Personal
Income: Revisited", Journal of Applied Econometrics, Vol. 10, No. 2,
1995, pp. 201-204.

This paper uses grouped 1990 income distribution data in 1991 dollars.
The first column reports the fraction of the sample included in each
income interval.  The righthand side of each interval is given in
the second column.

  fraction     Endpoint in thousands
     3.4            5
     5.5            10
     7.2            15
     15.5           25
     15.8           35
     19.9           50
     19.0           75
     7.6            100
     6.1            00  (infinity)

The sample size is 66,322.

Source: Current Population Reports, Consumer Income, Series p-60,
No. 180