On the federal level legislative history documents consist of bills and their amendments, hearings, committee reports, debates and presidential statements which can be access in print or via FDsys, The Missouri General Assembly on the other hand does not publish any committee hearings or reports for public access. There are very few documents available to the general public.  At best the researcher may end up with only an articles written by a sponsor, or left to compare the introduced bill to subsequent versions of the bill.