Introduction to the SYMBOL 2R programming language. - Hamilton Richards Jr.; Charles Wright Jr. (HLLCA, 1973)

The logical structure of the memory resource in the SYMBOL-2R computer. - Hamilton Richards Jr.; Roy J. Zingg (HLLCA, 1973)

Hardware-Software Interactions in SYMBOS-2R's Operating System. - Hamilton Richards Jr.; A. E. Oldhoeft (ISCA, 1974)