"This manual presents the principles for the employment of troops during domestic disturbances and the essential substances of the more important laws relating to the employment of military forces in the aid of civil authorities with the applicable War Department policies"

This document provide compiled list of U.S. Congressional Serial Set that were assigned serial numbers but not used. The list compiled to account for missing numbers from the U.S. Congressional Serial Set. Much of the information was extracted from old hand-written records and notations in copies of the Indexes to Reports and Documents and the Numerical Lists and Schedules of Volumes of the various Congresses maintained by the U.S. Government Printing office.