1967    An invitation to man-sign engineering. 
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1981    Devices for Displaying or Performing Operations in a Two-Valued System. 
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1982a   Designing signs that build the required semantics into the needed syntax. 
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1982b   Sign-creation and man-sign engineering. 
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1987a   Classroom inventions for the Logic Alphabet. 
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1988     Iconicity, models, and the geometry of logic. 
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1990     Before Peirce and icon/index/symbol. 
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1991     Peirce, iconicity, and the geometry of logic. 
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1993a   Symbolistics. 
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1993b   John James Van Nostrand and Sematology: Another neglected figure in American semiotics. 
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             Semiotics 1990, 224-240. New York: Lanham.
1993c   Cognitive frames, cognitive overload, and mind-held diagrams in logic. 
             In John Deely and Terry Prewitt (editors), 
             Semiotics 1991, 35-45. New York: Lanham.
1997a   Untapped potential in Peirce's iconic notation for the sixteen binary connectives. 
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1997b   On a deep correspondence between sign-creation in logic and symmetry in crystallography. 
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2003     Mathelogical semiotics: A lesson in constructing a shape-value notation for elementary logic. 
             In Myrdene Anderson, Adalira Saenz-Ludlow, Shea Zellweger, and Vic Cifarelli (editors),
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1993    Clark, Glenn, and Shea Zellweger. Let the mirrors do the thinking. 
            Mount Union Magazine 93, 2-5.

1996    Clark, Glenn, and Shea Zellweger. Let the mirrors do the thinking. 
            Hyperspace 5, 40-48.

1998    Clark, Glenn, and Shea Zellweger. Let the mirrors do the thinking.
            In Conference Proceedings, Reza Sarhangi (editor), Bridges: Mathematical Connections in 
            Art, Music, and Science, 113-119. Arkansas City, Kansas: Gilliland Printing.

2000    Clark, Glenn, and Shea Zellweger, Let the mirrors do the thinking.
            Revised for the Internet: Let the mirrors ...