Pothole erosion

[11] SPENCER JW, 1908, SCI AM, V89, P76

[12] STONE GH, 1899, US GEOL SURV MON, V34, P324

[13] SVENONIUS F, 1918, GEOLOGISKA FOREMNGEN, V40, P731

[14] UDDEN JA, 1925, TEX U B, V2509

[15] UPHAM W, 1900, GEOL SOC AM BULL, V12, P40

[16] 1866, OEFVERS KGL VETENSK

[17] 1841, ESSAI GLACIERS RHONE

[11] SPENCER JW, 1908, SCI AM, V89, P76

[12] STONE GH, 1899, US GEOL SURV MON, V34, P324

[13] SVENONIUS F, 1918, GEOLOGISKA FOREMNGEN, V40, P731

[14] UDDEN JA, 1925, TEX U B, V2509

[15] UPHAM W, 1900, GEOL SOC AM BULL, V12, P40

[16] 1866, OEFVERS KGL VETENSK

[17] 1841, ESSAI GLACIERS RHONE