McCammon is a small city in Bannock County, Idaho.
Photographs of existing tombstones in Harkness Cemetery, located in McCammon, are available online.
Many cemetery records for Idaho are included in LDS Cemetery Records which are a part of the holdings of the Family History Library in Salt Lake City. Harkness Cemetery is included in US Vol. 5 page 161 of that collection.
Information about cemeteries in adjoining areas of Bannock County is available on the Bannock County, Idaho Wiki page.
The Idaho State Historical Library in Boise has copies of the following newspapers published in McCammon.
McCammon News -- 5 Jan. 1917 through 29 Dec. 1960
McCammon News -- issues for 6 May 1938 and for 20 Dec. 1940
Bannock County News -- issues for 12 Oct. 1967 and for 2 Nov. 1967
Bannock County News -- 4 Jan. 1979 through 26 Apr. 1979
Wikipedia page for the City of McCammon