Not part of Legislative History, but potentially extremely uesful.
Congressional Research Service (CRS) Reports are well-researched, in-depth, non-partisan reports prepared for Members of Congress and congressional committees. CRS experts approach complex topics from a variety of perspectives and provide insightful and comprehensive analysis.
CRS does not make their reports directly available to the public. Many of them, however, can be accessed using the resources listed below. Another approach is to do an internet search for them using the search engine of your choice.
written by the Congressional Research Service, for the current session of Congress.
Lexis provides a selection of Congressional Research Service Reports. (in the main search box, type CRS, and select Congressional Research Service Reports from the drop down menu). Selective coverage begins in 1996 with increasingly more Reports available for current years.