International Labor and Working-Class History volume 99 has published and is available on Cambridge Core.
Links below provide free access to individual articles on the publisher's website. Here are two items in the volume that may be of interest to borderlands scholars.
The Humanization of Nature and Half-Earth Socialism
Drew Pendergrass, Troy Vettese
Gender, Race, and Migrant Labor in the "Domestic Frontier" of the Panama Canal Zone