Janet E Rupert

I'm creating some artwork for a cover for a reprint of The Indian Captivity of O.M. Spencer. I want an old map look of the Ohio region with the rivers, primarily. In the past I created a line drawing map of the state of Ohio in 150 dpi (dots per inch), but I need 300 dpi. I created the 150 dpi map myself from a topographic map of Ohio by using Photoshop to mark out all the itty bitty creeks, leaving only the major waterways. Everything available online is 1. copyrighted, 2. not suitable anyway. Bummer. I'm thinking of photographing a map I hand drew ages ago and seeing where that gets me.