The Serial Set is organized by each Congressional session.
For example, the 77th Congress is divided into the 1st Session (1942) and 2nd Session (1943).
Each book will have a Serial Number that serves as a volume number in the set.
Includes Congressional documents and committee reports.
Cuba: Situation in Cuba
S.rp. 2111 (87-2) 12420
S.rp. = Senate Report
2111 = Publication number (Senate Report # 2111)
(87-2) = 87th Congress, 2nd Session
12420 = Serial set "volume" number is 12420