Columbia subject headings:
Bierstadt, Albert, 1830-1902.
Ludlow, Fitz Hugh, 1836-1870.
West (U.S.)--Description and travel.
Harvard subject headings:
Bierstadt, Albert, 1830-1902.
Ludlow, Fitz Hugh, 1836-1870--Journeys--West (U.S.)
West (U.S.)--Description and travel
West (U.S.)--In art.
Princeton subject headings:
Bierstadt, Albert, 1830-1902.
Ludlow, Fitz Hugh, 1836-1870.
West (U.S.)--Description and travel.