Hillary Rodham Clinton's Rose Law Firm billing records, found in the White House residence in January 1996 two years after they had been subpoenaed by government regulators, disappeared shortly after the first lady was warned that the firm's billing problems were "very serious" and the then-ongoing Whitewater investigation could result in criminal charges, newly obtained records show.

More than 1,100 pages of grand jury testimony, investigative reports, memos, charging documents, chronologies, narratives and draft indictments, previously undisclosed but now being "processed" at the Library of Congress, say Mrs. Clinton knew considerably more about the firm's billing problems and their potential ramifications than she publicly acknowledged at the time.

According to the documents, given to the Library of Congress by the estate of Sam Dash, former ethics adviser to Whitewater Independent Counsel Kenneth W. Starr, Mrs. Clinton also knew that her former Rose partner Webster L. Hubbell was both the focus of the firm's billing concerns and a federal conflict-of-interest investigation, in which he was suspected of lying in a sworn statement to regulators about the firm's representation of a failed Arkansas savings and loan.