The following records are held in the Iowa Territorial and State Legislators Collection compiled by volunteers and staff at the State Historical Society of Iowa Library, Des Moines, Iowa.

State Historical Society of Iowa Library, website: http://www.iowahistory.org/libraries/index.html

State document regarding the death of and family of Samuel B. Gilliland of Linn Co., Iowa
https://www.legis.iowa.gov/DOCS/LSA/History_Docs/16th%20GA/Gilliland,%20Samuel%20B.pdf

Documents pertaining to the death of and family of Hon. Shirley Gilliland of Iowa (including obit)
https://www.legis.iowa.gov/DOCS/LSA/History_Docs/33rd%20GA/Gilliland,%20Shirley.pdf 

Documents related to the death of and family of John Melanchthon “Lank” Gilliland (including obit)
https://www.legis.iowa.gov/DOCS/LSA/History_Docs/20th%20GA/Gilliland,%20John%20M.pdf

Note: These are pdfs of original documents available for online viewing/downloading/printing