I'm surprised. There are few interesting historical artifacts on Tininan but it is so small. Anyway.
http://www.oac.cdlib.org/findaid/ark:/13030/kt3q2nd7m7/
The following concerns North Field, but, again, considering the size of Tinian, some overlapping material may be there.
http://www.mvariety.com/cnmi/cnmi-ne...book-on-tinian
http://www.mvariety.com/cnmi/cnmi-ne...n-in-the-works
Ed