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661. GTA91: General Topological Analysis Program by S. J. Zheng, Department of Chemistry, Hebei Teachers College, Schijiazhuang, Peoples Republic of China 050091 This package consists of a series of programs for analyzing wavefunctions produced by Ab Initio systems and plotting results. The primary programs in this package are ANAL: This program calculates 1. electronic density at a point 2. the Laplacian at a point 3. searching the saddle point of a surface 4. searching the saddle point of a Laplace surface 5. topological analysis for a saddle point TRS: This program prepares data files for ANAL based on input files from Ab Initio systems. NOTE:This system was originally tested for use on a PC, but was successfully tested on an RS/6000. Lines of Code: 3533 FORTRAN 77 (IBM RS/6000, SUN, PCs, etc.)