The 2017 LEGO 60139 City Police Mobile Command Center #1 instruction manual is a booklet that provides step-by-step instructions for building the LEGO set. Released in 2017 as part of the LEGO City theme, this manual is essential for assembling the Mobile Command Center set. It is designed specifically for LEGO enthusiasts who want to construct this particular model, ensuring they have all the necessary guidance and direction to complete the build. This manual is a valuable resource for fans of LEGO building toys.