How to Complete the National Register Registration Form outlines the requirements for maps and photographs. See also the National Register Bulletin How to Improve the Quality of Photos for National Register Nominations .
Some basic information is presented below.
Site maps drawn to scale are preferable. Maps should be folded to be no larger than 8 by 11 inches. The distribution of sites in a district. For districts, the number of the accompanying photographs intended to show views of the property. If the property is more than 10 acres, then a USGS map may be used in place of a sketch map as long as it can legibly show the required information.