Columbia subject headings:
Athos (Greece)--Description and travel.
Harper, Ralph, 1915-1996--Religion.
Harper, Ralph, 1915-1996--Travel--Greece--Athos.
Orthodox Eastern monasteries--Greece--Athos.
Harvard subject headings:
Athos (Greece)--Description and travel.
Harper, Ralph, 1915-
Monasticism and religious orders--Greece--Athos.
Princeton subject headings:
Athos (Greece)--Description and travel.
Harper, Ralph, 1915-1996--Religion.
Harper, Ralph, 1915-1996--Travel--Greece--Athos.
Orthodox Eastern monasteries--Greece--Athos.