For cemetery records, see Ola Cemetery at Find A Grave 
Idaho State University 1880 & 1900 census transcriptions 
1930 Census at Genealogy Trails 
For Hester Gross MacAskill Woody's story about Growing up on Squaw Creek, see GenWeb, Idaho, Gem County . Hester was the niece of Ruth Cramer Gross, the original Gross postmistress.
Gem County Museum and Historical Society, 501 E. First Street, Emmett, Idaho.
Gross Post Office
The Gross post office was established April 11, 1906, by Ruth E. Cramer Gross, wife of Richard Gross. Mrs. Jo K. Nesbitt, was appointed postmistress November 28, 1919; followed by Mrs. Anna Query, Oct. 26, 1929.
My grandmother, Hester Gross MacAskill Woody, in the early 1980's, wrote:
When a post office was to be formed a name was asked for, my mother (Annie Cramer Gross) and Aunt Ruth decided the name of Gross should be submitted. The name of Boston was also sent in. They were early day settlers on Squaw Creek, the place Nesbitts now have. My Aunt Ruth was the post mistress and the post office was held in her home. She had that for a number of years. When she gave it up, Io Nesbitt had it in her home, on the place where Homer Nesbitt now lives. Mrs. Nesbitt had the post office for quite a few years. It was still called the Gross post office. When she gave it up, it reverted back to a route as it is now. See Hester's complete story at 
Note: Ruth's and Annie's uncle John Jackson Cogburn was married to Liza Jane Boston. In 1902 Liza's brother William Boston received his original homestead for 160 acres in Section 2 and Section 11, Twp. 11 North, Range 1 East, B.M., along the Second Fork of Squaw Creek. Richard and Ruth Gross' 1909 homestead was about a mile south, along Squaw Creek, in Section 15.  The Bostons were also from Taney County, Missouri, as were the Cramers and the Cogburns.