R K Heffley

NATIONAL ADVANCED DRIVING SIMULATOR (NADS) REQUIREMENTS STUDY. VOLUME I: TECHNICAL SUMMARY

D H Weir, R K Heffley, 1991 .

NATIONAL ADVANCED DRIVING SIMULATOR (NADS) REQUIREMENT STUDY.: VOLUME II, FINAL TECHNICAL REPORT

D H Weir, R K Heffley, 1991 .

Study of a safety margin system for powered-lift STOL aircraft

R K Heffley, W F Jewell, 1978 .

Reduction of adverse aerodynamic effects of large trucks, Volume I. Technical report

D H Weir, R K Heffley, J F Strange, 1978 .