José Juan de Sanjosé Blasco et al. 2021. Multiple Geomatic Techniques for Analyzing Coastline Retreat: The Case of Gerra Beach (Cantabrian Coast, Spain) . Newest Updates in Physical Science Research Vol. 8. (Jun. 2021), 51–75. DOI:https://doi.org/10.9734/bpi/nupsr/v8/1776F.