The two main local newspapers that served the Mastic area in the 1920's were The Center Moriches Record (1900-1935) and The Patchogue Advance which was around since the late 1800's.
I recently discovered in the archives of The Floyd Estate that the Floyd and Nichols kids who summered out there, put out there own little newsletter called The Mastic News. I don't know how many issues they printed but I found it to be very informative, colorful,and entertaining. It gives you a look at some of the people and places that were around before the area was developed.