Columbia subject headings:
San Juan (P.R.)--Description and travel.
San Juan (P.R.)--History.
Harvard subject headings:
San Juan (P.R.)--Buildings, structures, etc.
San Juan (P.R.)--Description and travel.
San Juan (P.R.)--History--Chronology.
San Juan (P.R.)--History.
Princeton subject headings:
San Juan (P.R.)--Buildings, structures, etc.
San Juan (P.R.)--Description and travel.
San Juan (P.R.)--History--Chronology.