statistical abs ... united states - p 2001 ed. = answers
  REFERENCE QUESTIONS:
race, sex, and age: 1998 [ = 2001, # 98 or p 74 ]
concentrations between 1990 to 1999 [ = # 355 or p 216 ]
1999.
[ = # 168 or p 113 ]
in the United States? [ = # 202 or p 129 ]
wood products by railroad in 1999? [ = # 1115 or p 697 ]
in 1998? [ = # 1271 or p 777 ]
1993 and 1999. [ = # 223 or p 143 ]
[ = # 802 or p 525 ]