source_documents: 23

The program file or page each row was read from.

This data as json

rowid	id	year	kind	url	rights
23	wayback-98-program-mm.htm	1998	html	https://web.archive.org/web/20010114143800id_/http://www.ncte.org:80/cccc/98/program/mm.htm	NCTE; Wayback Machine replay, private capture