Beth,
I just got a copy of the listing of Martins buried at the Princeton Oakridge Cemetery from Davenport Public Library - pages 213, 214 and 241 from the cemetery Record Book. Dates are burial dates.

page 213
Lot 5 - block 1 - Edger F. Martin
Almeda G. Martin, 1914, age 28
Edgar F. Martin 15 July 1935, age 62

Lot 6 - block 1 - Peter H. Martin
Margaret Martin first wife of A.E. Martin, 11 or 14 Apr 1874, 65 yrs 7 mos.
Peter H. Martin blank
Emma Martin 18 Feb 1925

Lot 8 - block 1 - Peter Ulam
Eliza Ulam 14 Oct 1895, age 81
Peter Ulam 17 May 1887, age 77 yrs. 4 mos. 16 days
Hannah Simson 5 April 1866, age 43****
Carrie Simson (blank) 11 mos.

Other names on this page are Brown, Maxwell, Phillips, Shaw, Doty, Farber, Ammon, Murphy, Roesger, Moss, Rook, Schmalz.

page 214
Lot 15 - block 1 - Peter Ulam
John W. Leonard --------
Martha Leonard --------

Lot 17 - block 1 - Robert H. Martin
Martin
Robert Martin 22 Apr 1913, 69 yrs. 2 mos. 7 days
Martha Martin 9 Jan 1923, age 78
Laura Belle Martin 27 Jan 1908, 2 mos. 3 days
Jane Martin 2nd wife of A.E. Martin ---------
Wm. A. Martin ----, age 76

other surnames on this page are Chapman, Ney, Damon, Fanning, Long, Engel, Day, Courtney, Gilbert, Bickel, Congleton and Schmalz.

Page 241
I'm not quite sure what this page is, as it lists various people associated with various lots - they could be additions and corrections, I'm not sure. It does list:
242-Martin 1st Sgt. Peter H. Martin Co. C. 20th Ia. Inf.
243-Martin William F. Son of A.E. & M. Martin died Mar or May 18, 1855
=========

This would appear to read that Hannah (Ulam) Simson was buried 5 April 1866 at age 43. Sad there is a little Carrie Simson who would have appeared to have been buried with her who died at 11 mos. but the burial date is blank.

There is a John B. Doty and Anne J. Farber buried in Lot 7 between Peter H. Martin lot 6 and Peter Ulam lot 8.

Let me know if you want me to send anything else on the other names I listed. I find it interesting that there is a Jane Martin, 2nd wife of A.E. Martin listed in the Robert H. Martin lot 17 - with blanks next to it, as that must be Amanda J. Griner Martin who is buried with her parents in Searl's Ridge Cemetery, near Princeton, IL.

I also found some MOSS related to some MOSS buried in Searl's Ridge Cemetery as well.

dorrie