Legislative history refers to the documents produced by the legislature as a bill is introduced, studied and debated. The intent of the legislature is one of the arguments you can use when arguing how a ambiguous statute should be interpreted. Legislative histories for major laws are sometimes compiled and published in a single collection. These compilations can be very helpful because they gather all of the legislative sources relating to a law in one place. Therefore, it may be worth your while to determine if one of these exists before attempting to compile the sources on your own.
For information on finding legislative history, use the following research guides & resources:
University of Cincinnati Libraries
PO Box 210033 Cincinnati, Ohio 45221-0033