Columbia subject headings:
Letter writing, Spanish--History--17th century.
Letter writing, Spanish--History--18th century.
Reading--Spain--History--17th century.
Reading--Spain--History--18th century.
Harvard subject headings:
Letter writing, Spanish--History--17th century.
Letter writing, Spanish--History--18th cenrury.
Reading--Spain--History--17th century.
Reading--Spain--History--18th century.
Princeton subject headings:
Catechetics--Early works to 1800.
Spanish language--Readers--Early works to 1800.
Spanish language--Readers--History--17th century.
Spanish language--Readers--History--18th century.