GEOS Programs Directory 1990 by Peter T. Hughes (GEOS ARENA software librarian for QuantumLink and editor for GEOWORLD) - This document is a great reference for programs that were available for GEOS 64/128 in 1990 and covers every category you could think of.  Each listing includes an image of the programs Icon, the authors information, release date, program size and description.  I can't imagine how much time it must have taken to get all this compiled, especially getting all those icons extracted and put into a word processor / desktop publishing program. 

Thanks to Bruce Thomas for sharing this valuable reference.  You can find further information on where these GEOS programs can be found by checking out Bruce's location information document.