column
1999, 15(11): 973-974.
1999, 15(11): 981-982.
1999, 15(11): 1023-1024.
1999, 15(11): 1042-1042.
The Investigation on the Living Places and Occurrence Ratio of Cockroach in Cities of Hebei Province
1999, 15(11): 1048-1048,1049.