共 12 条
[1]
*AER CHART INF CTR, 1955, TECH REP, V70
[2]
ANGWIN JBP, 1956, 204 OH STAT U RES F
[3]
King C., 1957, T EDINBURGH GEOL SOC, V17, P81
[4]
LINTON DL, 1951, LONDON ESSAYS GEOGRA, P199
[5]
MACGREGOR DR, 1957, GEOGRAPHY, V42, P167
[6]
MILLER OM, 1951, 151 OH STAT U RES F
[9]
*USDA, 1951, HDB, V18, P160
[10]
WATERS RS, 1958, GEOGRAPHY, V43, P10