Ian Theasby/ Henry David Firth
(5)
Andrew E. Steinmann/ David G. Firth (EDT)/ Tremper Longman III (EDT)
(1)
David Firth/ Adrian H. Curtis (EDT)
(1)
David G. Firth (EDT)/ H. G. M. Williamson (EDT)
(1)
David G. Firth (EDT)/ Philip S. Johnston (EDT)
(1)
David G. Firth/ D. L. Morcom (FRW)
(1)
David G. Firth/ Lindsay Wilson
(1)
David Warrell (EDT)/ Timothy Cox (EDT)/ John Firth (EDT)/ Jeremy Dwight (EDT)
(1)
David Warrell/ Timothy M. Cox/ John Firth/ Mili Estee Torok
(1)
Firth, David G.,Grant, Jamie A.
(1)
Firth, David G.,Wegner, Paul D.
(1)
Grenville J. R. Kent/ David G. Firth (FRW)
(1)
Isabelle M. Hamley/ David G. Firth (FRW)
(1)
Knut Martin Heim/ David G. Firth (EDT)/ Tremper Longman III (EDT)
(1)
Paul R. House/ David G. Firth (EDT)/ Tremper Longman III (EDT)
(1)