Donald R. Prothero/ Timothy D. Callahan/ Michael Shermer (FRW)
(2)
Michael Callahan/ Kristin Kalbli (NRT)
(2)
Sly, Gordon,Callahan, Michael R. (Michigan State University, USA)
(2)
;Leong, Frederick T. L., PhD,Callahan, Jennifer L.,Zimmerman, Jeffrey,Constantino, Michael J., PhD,Eubanks, Catherine F.
(1)
Donald C. Orlich/ Robert J. Harder/ Richard C. Callahan/ Michael S. Trevisan/ A Brown
(1)
Donald C. Orlich/ Robert J. Harder/ Richard C. Callahan/ Michael S. Trevisan/ Abbie H. Brown
(1)
Jonathan P. Tomes/ Michael Callahan/ Alice M. Mccart/ Karl Mueller
(1)
Lauren Callahan/ Michael T. Callahan
(1)
Michael T. Callahan (EDT)
(1)
Michael Wm. Marks/ Philip Callahan/ Mike Grill
(1)
R. M. Douglas (EDT)/ Michael D. Callahan (EDT)/ Elizabeth Bishop (EDT)
(1)