共 11 条
[1]
BRADLEY WH, 1940, US GEOL SURV PROF PA, pA196
[3]
EMERY KO, 1939, GEOL SOC AM BULL, V50, P1908
[4]
HVORSLEY MJ, 1940, AM SOC CIVIL ENG CAM
[5]
PETTERSSON H, 1930, FASCICULE 81 RES CAM
[6]
PIGGOT CS, 1939, J WASH ACAD SCI, V29, P405
[7]
PIGGOT CS, 1941, GEOL SOC AM BULL, V52, P1513
[8]
PIGGOT CS, 1936, GEOL SOC AM BULL, V47, P675
[9]
PIGGOT CS, 1938, SCI MONTHLY, V47, P201