Note a — Front matter (continued 2)
Reading edition
Extends from the subtropics north to the northern limit of Bassariscus astutus' distribution (Hall and Kelson, 1959:881), which approximates the 10°C isotherm for average annual temperature in the United States (Kincer, 1941). [b] Extends northward from the 10°C isotherm for average annual temperature in the United States.