I'm not sure if this is the right forum for this, as it's not exactly a mapping question.

I found this online map of Newark, DE, circa 1878 and thought it would look nice on my wall (I'm from Newark).

map-newark-1878-beers.jpg

I decided it would look better as two separate maps, so I messed with them in photoshop to make the following two images.

The issue: each of these files about 36"x24" at 72 ppi, the resolution of the original, but I realize that this is sort of a low resolution for printing. In photoshop, I set them both to 300 without changing the size. That doesn't really make sense to me, but photoshop let me do it, so I don't know what exactly it did to the images.

When I zoom way in on the computer to make it about 36x24, it looks good (i.e., not blurry), but I don't know if this will translate to a printed page.

If anyone who knows what to look for could look at these images and tell me if I should have them printed in that size, please let me know. If you wouldn't advise me to do that, what are my other options?

Also, anyone know of a high-res version of this map? (I figure it couldn't hurt to ask.)