Did some checking on this family group for you.Based on the 1880 NM, Mora Co, La Cueva twp census the entry below sent to you would be your Nepomoseno Salazar:
"I checked further in the Mora records I have and found another Juan Nepomuceno Salazar, son of Maria Soledad Salazar, from La Cueva, marrying on Jan 6 1879 in Mora with Maria Francisca Blan, daughter of Pacifico Blan, from La Cueva. Wit and Padrinos: Jose Dionisio Aveyta [sic] and Maria Lucia Martin."
The 1910 census for them states married 31 years and that would match the 1880 census:
1880 N.M., Mora Co, La Cueva twp h/h20 Casados, Tomas 20, Indian , Camila 19, indian (wife) Salazar, Soledad 44, indian (mother) , Nepomoseno 29, indian (son) , Francisca 17, white (his wife) , Tomasa 2/12, bn Mar 1880, indian (daughter) Espinosa, J. Crisanto 28 or 25 , Eulogia 21 (wife) Salazar, Agapito 35, indian , Juana 26, indian (wife) , Socorro 8 , Roberto 3 , Juan Bautista 2 , Prospecto 20, indian, (brother) As you probably already know the ages on these early census records are often off abit.Camila Salazar (wd) with her Casados children is on the same page as Nepomoseno Salazar for the 1900 NM, Mora Co, La cueva twp census.The brother Prospecto is probably a misspelling of the name.I am betting that Camila, Nepomoseno, Eulogia, Agapito & Prospecto (sic), are all the children of Soledad Salazar.I have listed this addtl info on the possible siblings so you can cross check the Mora County Catholic Church records on them. If the info sent to you was from an index, the name Blan could have been misread, maybe Blaz/Blas??Just a thought.If you can find the baptisms of their children sometimes it will list the grandparents, thought would give you addtl clues.