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Senate reports had always been numbered by Congress and all other publication series are now numbered by Congress as well.
Before 1979 session volume numbers were assigned to each publication series within each congressional session, with the documents and reports for each publication series generally bound together in ascending numeric sequence.
The subject classes of the publication series are as follows: Claims, Commerce and Navigation, Finance, Foreign Relations, Indian Affairs, Military Affairs, Naval Affairs, Post Office Department, Public Lands, and Miscellaneous.
It generally includes committee reports related to bills and other matters, presidential communications to Congress, treaty materials, certain executive department publications, and certain non-governmental publications.