共 13 条
[1]
DACHNOWSKI AP, 1912, GEOL SURV OHIO 4 SER, V16, P19
[2]
GEIKIE A, 1903, TXB GEOLOGY, V1, P608
[3]
LANE GEORGE H., 1931, OHIO JOUR SCI, V31, P165
[4]
LESQUEREUX L, 1885, VEGETABLE ORIGIN COA, P95
[5]
MOORE ES, 1922, COAL, P146
[6]
PERKINS GH, 1927, REPORT VERMONT STATE, V15, P13
[9]
SOPER EK, 1922, US GEOL SURV B, V728, P12
[10]
TWENHOFEL WH, 1926, TREATISE SEDIMENTATI, P287