Here's a RAR containing all the minimaps from OSpRose (With the addition of 61 and 62) with an overlay grid and numbering. This is to help find what IFO you want to open to add new content. The IFO's are actually named YY_XX.IFO instead of the standard XX_YY.IFO you would expect, so keep that in mind.
There's 36 maps total.
http://www.filedropper.com/rosemapgrid