Here are the data structures with brief descriptions:

CAction
CActItem
Calloc_handle_t
Calloc_hdr_s
Calloc_root_s
CaRule
CFloatlist
CHTentryStruct
CIDstring
CPremise
CSadjlist
CScontrol
CScoord
CScurve
CSdemand
CSField
CSlink
CSnode
CSpattern
CSpump
CSseg
CSsource
CStank
CSvalve
CTmplist