The link provided indicates: "The fee is $ 10.00 per half hour, ($ 10.00 minimum fee) plus $.25 for each copy made for you".
This 1880 census for Portland Geo H Erway, age 60, born in NY to both parents born in NY, "appears" to be a Harnesmaker Mary E. Erway, 47, Keeps Lodging house, born NY to both parents born in NY.
Not much information to work on...then I found your family tree posted online at Ancestry.com.You should include the link in future postings as it gives the needed data. http://trees.ancestry.com/tree/11210249/person/-480357040?ssrc=http://trees.ancestry.com/tree/11210249/person/-480357040?ssrc= Ancestry members can access it.Non-members can if they sign up for a free 14 day membership by providing a credit card, if they don't cancel before the end of 14 days, membership charges will be deducted.OR, they can access via many libraries having access through their systems AT the library using the persons LIBRARY CARD NUMBER.
First, you show a connection to the Oregon Death Index which shows an Elizabeth Mary Jones, death 20 Oct 1928 in Linn County.How did you identify this person, other than the Oregon Death Index?The Oregon Death Index does not show dates of birth, places of birth.
Cemetery transcriptions are not completed, some not at all.Finding their gravesite is extremely unlikely at this time.Death Indices are far from complete, some local counties in Oregon did maintain some records.The State of Oregon did not take over the death records until 1903.
You also identified a burial in Clackamas County, OR, where the stone only shows "Mary", with no dates.That probably is a wild guess.There is no way to confirm, especially since there doesn't appear to be any history of her living there.
So, you MUST start with Portland.The City Directories (Polks) probably started around this date.Have someone look at these annual books to see what can be found for "Erway".These directories are found in many locations.I know the Seattle Downtown library has them for Portland.They should show Geo Erway (spouses were not fully included until later), but, if he had died, it should show her as being the head, especially if she was running a boarding house.
Also, try to obtain the obits of their children.It might have information on the parents.
I also checked books for their names on Heritage Quest.com, without success.