In the NES era, Nintendo Power Magazine offered many Nintendo fans their first glimpse of upcoming games and poring over the detailed maps and tantalizing bits of info was a ritual as important as playing the games themselves. The Magazine was discontinued in 2012.
You can download and read issues of Nintendo Power at archive.org, including issue #1. The issues listed in the archive site are not in PDF format, but instead CBR which is a zip file with JPG scans of every page. You can either unzip it or use a free CBR/CBZ reader.