The Library-file is the most complete of all the catalogue files. It includes listings of all the manuscripts microfilmed in the IMHM including those that have not been catalogued. It also includes some desiderata not yet filmed. The file is arranged in Hebrew alphabetical order of the libraries listed according to their localities . Whenever manuscripts are listed by their catalogue numbers signatures are added in parentheses.
Many manuscripts contain several bibliographical units.
Each bibliographical unit is described on a separate card. In referring to manuscripts in scholarly publications the correct signatures should be accurately quoted, but no reference to the unit numbers should be made. In some cases, particularly in private collections where no signatures were assigned by the owners, MSS are listed by arbitrary numbers enclosed in square brackets. These numbers should not be used in references to the manuscripts. Full details concerning signatures are provided at the beginning of each library file.