A record of sources, arranged both by places and subjects is of service. Under your subject list enter the names and addresses of those who are specialists. Experts throughout the country will thus be at your command. In the geographical list, put the names of parties to whom you may apply for material relating to a given community. Suppose for instance, that your state is contemplating a Workmen's compensation law and some state where there is no legislative reference department is also considering the matter. This state passes a law on Tuesday, and on Saturday the bill of your own state is coming up for consideration. You need exact information as to which bill is passed, whether it passed with or without amendments; in fact, you must have immediate and full knowledge concerning that law. You may have within your mind some possible source, but during the stress and pressure of the legislative session such a list relieves one of the necessity of remembrance. The catalog, through its mechanical devices, can carry this burden. The catalog is not merely a record of sources within the four walls, but must endure as a record of all possible available sources, so that time and energy given to "the living part" of the catalog, is well expended. In addition to the sources already mentioned, there are numerous other possible indexes of value. When the bills are available in printed form, a subject index indicating the final disposition of a bill--whether killed, passed or vetoed--is of inestimable use. Such indexes for the general laws and the local and temporary laws are advantageous. A comparative index, apart from the regular catalog, already noticed, may be mentioned again in this connection. An index of the documents of the state is also a valuable asset, since the publications of most states are rather poorly indexed and have practically no centralized list of subjects. The decisions of the attorney-generals quite often are of as much importance in law conclusions as are the decisions of the courts. They have virtually either vitalized or invalidated laws upon the statute books. In states where statute revisions are rather infrequent, statute indexes may be necessary. These indexes should be made supplementary to the regular catalog. Some of them may be carried along as side issues at the same time as the regular work, and others may be taken up in their entirety to be accomplished as time permits.