source_documents: 50

The program file or page each row was read from.

This data as json

rowid	id	year	kind	url	rights
50	wayback-99-sessionn.htm	1999	html	https://web.archive.org/web/19990909120852id_/http://www.ncte.org:80/cccc/99/sessionn.htm	NCTE; Wayback Machine replay, private capture