Aids to Acoustical Research - Serro Stability of Controlled Stimulus Excitation Systems. High Frequency Audiometer, Calculations, etc. 1979, (letters, notes, calculations and graphs); Design Notes for a Repetition-Rate Extractor, 1983, (notes, figures, and calculations); High Frequency Plotter Graphics, 1985, (annotated printouts, figures, and calculations); Dual Tone-Source Circuits, 1985, (figures and calculations)