Chain Indexing Dr. S. R. Ranganathan

Uniterm Indexing Mortimer Taube

Citation Indexing E. Garfield

KWIC/KWOC H. P.  Luhn

Subject Indexing Coat

Systematic Indexing Kaiser

POPSI G. Bhattacharya

PRECIS Derek Austin

Automatic Indexing Ohlman

SLIC Indexing Sharp