 Research has confirmed in some cases volume numbers were assigned to particular titles that were never published or appeared in later volumes.GPO has issued a list of "Assigned Serial Numbers Not Used".A bibliographic citation such as "35th Congress, 2nd Session, House Miscellaneous Document #43 Claims of citizens of Territory of Kansas" (or the equivalent shorthand version "35th-2nd H.misdoc 43") will be found in the Serial Set.