PHYSIOGRAPHIC BOUNDARIES WITHIN THE UNITED STATES

[1] ADAMS GI, 22 US GEOL SURV 2, P69

[2] ADAMS GI, B AM GEOGR SOC, V34, P89

[3] BOWMAN, FOREST PHYSIOGRAPHY, P222

[4] DRYER, STUDIES INDIANA GEOG

[5] FAIRCHILD HL, NY STATE ED DEP B, V519

[6] *GA GEOL SURV, 1910, B GEORG GEOL SURV, V23

[7] HAYES CW, 19 US GEOL SURV

[8] HILL RT, PHYS GEOG TEXAS REG, V3

[9] HILL RT, 1900, US GEOL SURV TOPOGRA

[10] JOHNSON WD, 1900, 21 US GEOL SURV 4

[1] ADAMS GI, 22 US GEOL SURV 2, P69

[2] ADAMS GI, B AM GEOGR SOC, V34, P89

[3] BOWMAN, FOREST PHYSIOGRAPHY, P222

[4] DRYER, STUDIES INDIANA GEOG

[5] FAIRCHILD HL, NY STATE ED DEP B, V519

[6] *GA GEOL SURV, 1910, B GEORG GEOL SURV, V23

[7] HAYES CW, 19 US GEOL SURV

[8] HILL RT, PHYS GEOG TEXAS REG, V3

[9] HILL RT, 1900, US GEOL SURV TOPOGRA

[10] JOHNSON WD, 1900, 21 US GEOL SURV 4