By Vacca, Roberto.
Madrid Editora Nacional 1973 .
214 p. , Translation of: Ill medioevo prossimo venturo.

By Corts Grau, José.
Madrid Editora Nacional 1948 .
295 p. 20 cm..

By Sáiz Cidoncha, Carlos.
Madrid Editora Nacional 1974 .
256 p. 22 cm..
8727611803

By Gonzalo Rubio, Jerónimo..
[Madrid Editora Nacional 1973 .
357 p. 21 cm..

By Schreier, Fritz..
Mexico, D.F. Editora Nacional 1975 .
285 p. , "Traducción directa por Eduardo García Maynez." 24 cm..

By Sánchez Agesta, Luis..
Madrid Editora Nacional 1963 .
xv, 532 p. 24 cm..

By La Orden Miracle, Ernesto..
Madrid [Editora Nacional] 1965 .
36 p. 20 cm..

By Panero, Leopoldo.
Madrid Editora Nacional 1944 .
2 v.

By Garcia Venero, Maximiano..
Madrid Editora Nacional 1969 .
664 p. 24cm..

By Menéndez Pelayo, Marcelino.
Madrid Editora Nacional 1956 .
305 p. 22 cm..

By Fernández Alvarez, Manuel.
Madrid Editora Nacional 1955 .
126 p. 23 cm..

By Rodriguez Alcalde, Leopoldo..
Madrid Editora Nacional 1956 .
289 p. 22 cm..

By Medina Maisonave, Alberto..
Hato Rey, P. R. Editora Nacional 1971 .
175 p.

By Ponce, Fernando.
Madrid Editora Nacional 1969 .
282 p. 25 cm..

By Malet, Alberto.
México Editora Nacional 1967 .
168 p.