Lava Flow That Came to Hilo--The 1880-81 Eruption of Mauna Loa Volcano, Island of Hawai'i [open pdf - 70MB]
From the Introduction: "It has been more than a century since Mauna Loa lava came to Hilo, yet there is much to learn about past events. Details from the progress and response to the eruption of 1880-81 may offer guidance about how to alleviate the threat to Hilo from the next Mauna Loa eruption. Many Mauna Loa flows advanced toward Hilo, but only one flow came close in at least 750 years. As Hilo town boundaries expand westward toward vents within Mauna Loa's Northeast Rift Zone, the chances of an eruption affecting Hilo residents increase."
Scientific Investigations Report 2019-5129
U.S. Geological Survey Publications: https://pubs.usgs.gov/