Construction of MCI microwave network. Slides present stages of microwave tower construction and equipment shelter installation, parts of constructed towers and roof top antennae, multiplex equipment, panoramic views from sites at daytime and at sunset, views of towers covered with ice, roadways to the sites, etc. Among presented locations are MCI sites in Arizona, Indiana, Michigan, Ohio, and Texas. Duplicates and poor quality slides were removed from the collection. The fourth book contains slides sorted under subjects [Advertisement Print, Advertisement - TV, Buildings & Facilities, Events, People, Sales promotions, Sites, Technology] in order to make corresponding photographs.