Columbia subject headings:
Architectural drawing--19th century--Germany--Catalogs.
Architectural drawing--Germany--Cologne--Catalogs.
Hittorff, Jacques Ignace, 1792-1867--Catalogs.
Universitäts- und Stadtbibliothek Köln--Catalogs.
Harvard subject headings:
Architectural drawing--Germany--19th century--Catalogs.
Architectural drawing--Germany--Cologne--Catalogs.
Hittorff, Jacques Ignace, 1792-1867--Catalogs.
Lecointe, Jean-François-Joseph, 1783-1858--Notebooks, sketchbooks, etc.
Universitäts- und Stadtbibliothek Köln--Catalogs.
Princeton subject headings:
Hittorff, Jacques Ignace, 1792-1867.