I donot see either of them for those dates in the Frost or Perkins plots.There is a Mary E.Perkins 1870-1950 and Mary A Perkins 1900-1950...doesn't mean they aren't there.I went to both Princeton cemetaries 3 years ago and photographed many of the stones...alot of folks are buried in other family plots with no stones,one of my GGrandfathers is such.I also have quite a few town records and the cemetary records on CD's that I made an gave to the town of Princeton,they have them at the town hall.I would be happy to make you copies of the CD's and mail them to you.You can contact me at Veggiepal2@yahoo.com .There are also several farm cemetaries in Princeton that are probally overgrown and unrecorded.As well as church plots that have seemingly disappeared over time.Do you have the Death Certificates on them?Princeton will tell you they were lost in a fire,but they should be recorded by the State and you can obtain copies that may help in locating the exact burial location.