The following Census images have been uploaded to the USGenWeb Archives:
http://www.rootsweb.com/~usgenweb
1920 Howell County, MO
http://www.rootsweb.com/~usgenweb/mo/howell/census/1920/
1880 Onslow County, NC
http://www.rootsweb.com/~usgenweb/nc/onslow/census/1880/
1790 State of South Carolina, including transcription and index
http://www.rootsweb.com/~usgenweb/sc/census/1790/
Thanks!
Linda