 Volumes of the Serial Set have been sent to federal depository libraries over the years by the GPO, but many such depositories hold only a partial collection of the set for a variety of reasons (e.g., age of the depository).Also, House Report 104-657 directed that distribution be limited to regional depositories plus certain others designated by Congress (beginning with the volumes covering the 105th Congress and commencing with v.14388).An exception are Serial Set volumes judged to be key Congressional publications by GPO, thus receiving distribution to all depository libraries.