Gibbs, K. Elizabeth; Bradeen, Billie; Boland, Dan (September 2004). "Spatial and Temporal Segregation Among Six Species of Coexisting Ophiogomphus (Odonata: Gomphidae) in the Aroostook River, Maine". Northeastern Naturalist. 11 (3): 295–312. doi:10.1656/1092-6194(2004)011[0295:SATSAS]2.0.CO;2. ISSN1938-5307. JSTOR3858420.
Gibbs, K. Elizabeth; Bradeen, Billie; Boland, Dan (September 2004). "Spatial and Temporal Segregation Among Six Species of Coexisting Ophiogomphus (Odonata: Gomphidae) in the Aroostook River, Maine". Northeastern Naturalist. 11 (3): 295–312. doi:10.1656/1092-6194(2004)011[0295:SATSAS]2.0.CO;2. ISSN1938-5307. JSTOR3858420.
U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National MapArchived 2012-03-29 at the Wayback Machine, accessed June 22, 2011
U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National MapArchived 2012-03-29 at the Wayback Machine, accessed June 22, 2011
Gibbs, K. Elizabeth; Bradeen, Billie; Boland, Dan (September 2004). "Spatial and Temporal Segregation Among Six Species of Coexisting Ophiogomphus (Odonata: Gomphidae) in the Aroostook River, Maine". Northeastern Naturalist. 11 (3): 295–312. doi:10.1656/1092-6194(2004)011[0295:SATSAS]2.0.CO;2. ISSN1938-5307. JSTOR3858420.