Here are the data structures with brief descriptions:

__cob_global
__cob_module
__cob_screen
attr_list
base_list
calc_struct
call_hash
call_list
cb_alphabet_name
cb_alt_key
cb_alter
cb_alter_id
cb_assign
cb_attr_struct
cb_binary_op
cb_call
cb_cancel
cb_cast
cb_class_name
cb_const
cb_continue
cb_debug
cb_debug_call
cb_decimal
cb_define_struct
cb_direct
cb_exception
cb_field
cb_file
cb_funcall
cb_goto
cb_if
cb_initialize
cb_integer
cb_intrinsic
cb_intrinsic_table
cb_key
cb_label
cb_level_78
cb_list
cb_literal
cb_locale_name
cb_para_label
cb_perform
cb_perform_varying
cb_picture
cb_program
cb_reference
cb_replace_list
cb_report
cb_search
cb_set_attr
cb_statement
cb_string
cb_system_name
cb_text_list
cb_top_level_78
cb_tree_common
cb_word
cob_alloc_cache
cob_call_struct
cob_call_union
cob_content
cob_decimal
cob_external
cob_field
cob_field_attr
cob_file
cob_file_key
cob_fileio_funcs
cob_fp_128
cob_frame
cob_func_loc
cob_inp_struct
cob_linage
cob_report
cobc_mem_struct
cobc_reserved
cobitem
cobjmp_buf
cobsort
config_struct
copy_info
date_format
dlm_struct
exit_handlerlist
expr_node
field_list
file_list
file_struct
filename
handler_struct
handlerlist
int_node
label_list
literal_list
local_filename
longoption_def
nested_list
noreserve
optim_table
option
plex_stack
queue_struct
runtime_env
sort_list
sort_mem_struct
strcache
string_list
struct_handle
system_struct
system_table
time_format
yy_buffer_state
yy_trans_info
yyalloc
YYSTYPE