D. Ladd
发表
R. Harris,
W. Buck,
C. Roy,
2017,
Northeastern Naturalist.
J. W. Thieret,
D. Ladd,
R. Mohlenbrock,
1978
.
Douglas Ladd,
D. Ladd,
2002,
Brittonia.
D. Ladd,
F. Oberle,
1995
.
D. Ladd,
Justin R. Thomas,
2015
.
J. B. Taft,
Linda A. Masters,
D. Ladd,
2003
.
D. Ladd,
Caleb A. Morse,
2021,
The Bryologist.
D. Ladd,
Caleb A. Morse,
2016,
The Lichenologist.
D. Ladd,
Caleb A. Morse,
2013,
The Lichenologist.
R. Harris,
D. Ladd,
G. Wilhelm,
1994,
Evansia.
D. Larsen,
Jennifer Grabner,
D. Ladd,
2004
.
D. Ladd,
Caleb A. Morse,
2019,
The Lichenologist.
D. Ladd,
G. Wilhelm,
1992
.
D. Ladd,
G. Wilhelm,
1987
.
R. Harris,
J. Lendemer,
D. Ladd,
2016,
The Bryologist.
D. Ladd,
Caleb A. Morse,
2022,
The Bryologist.
R. Egan,
S. Morgan,
C. Wetmore,
2002
.
M. H. MacRoberts,
B. R. MacRoberts,
D. Zollner,
2005
.