Congressional Serial Set nos. These volumes are on microfiche and are located in the Documents Microforms Area. Ask a documents staff member for help locating the volumes you need. Some of these are also in paper, so you can check the documents stacks first, if you prefer paper to microfiche. There are some gaps, particularly before 1933.
Some documents are long, multi-volume sets.
Generally these sets have their own indexes that provide access to the set. The resources listed below may be useful for many of your topics. You may browse the stacks or use the indexes available with the sets. This is an online resource containing the debates of the 18th Congress, 2nd session through the 25th Congress, 1st session. Ed. charles Kappler.