Carmel Pilcher/ David Orr/ Elizabeth Harrington
(2)
David R. Orr/ David Truesdale
(2)
William Sarni/ Stuart Orr/ David Grant
(2)
;Orr, Jeffrey,Stirrup, David
(2)
Alex Calder (EDT)/ Jonathan Lamb (EDT)/ Bridget Orr (EDT)/ David Nichol Smith Memorial Seminar 1993 (University of Auckland)
(1)
Andres R. Edwards/ David W. Orr (FRW)
(1)
Clarence R. Geier (EDT)/ Lawrence E. Babits (EDT)/ Douglas D. Scott (EDT)/ David G. Orr (EDT)
(1)
Cosimo A. Sgarlata (EDT)/ David G. Orr (EDT)/ Bethany A. Morrison (EDT)
(1)
Daniel M. Sivilich/ David Gerald Orr (FRW)/ Douglas D. Scott (INT)/ Henry M. Miller (CON)
(1)
David Gerald Orr (EDT)/ Matthew B. Reeves (EDT)
(1)
David Orr (EDT)/ Andrew Gumbel (EDT)/ Bakari Kitwana (EDT)/ William Becker (EDT)
(1)
David W. Orr,Bill McKibben
(1)
David W. Orr/ Christopher Hurt (NRT)
(1)