Abstract The Armijo and Gallagher families papers include personal, business and legal documents primarily concerning Nestor Armijo’s involvement in mercantile and ranching interests during the late-1800s in southern New Mexico. The bulk of the papers document how the Armijo family established itself as one of the most well-known mercantile families of territorial New Mexico. A good deal of material pertains to the Armijo home, which is on the National Register of Historic Places.