Fernand Cabrol and Henri Leclercq, eds, Dictionnaire d’archéologie chrétienne et de liturgie, 15 vols. in 30 parts, with vols. 14.2–15.2 ed. Henri Marrou (Paris: Letouzey et Ané, 1907–53).

All but three volumes of this mighty and indispensable reference work have been made accessible online in various places. Most have been made available at “Gallica” by the Bibliothèque nationale de France. Several others can be found at the Internet Archive or (with a US IP address) at the Hathi Trust Digital Library.

Vol. 1.1 (1907): A – Amende. [Gallica – ends col. 1504 “Ame”] | [archive.org]

Vol. 1.2 (1907): Amende – Azymes. [Gallica – starts. col. 1505 “Ame”] | [Hathi Trust – US only]

Vol. 2.1 (1910): B. [Gallica] | [Hathi Trust – US only]

Vol. 2.2 (1910): C – Cézène. [Gallica] | [Hathi Trust – US only]

Vol. 3.1 (1913): Chainage – Chypre. [Gallica] | [archive.org]

Vol. 3.2 (1914): Ciacconio – Cyzique. [Gallica] | [archive.org]

Vol. 4.1 (1920): D – Domestici. [Gallica] | [archive.org]

Vol. 4.2 (1921): Domestici – Employé. [Gallica – starts at col. 1385 “Dominicale”] | [archive.org]

Vol. 5.1 (1922): Encaustique – Feu. [Gallica] | [archive.org]

Vol. 5.2 (1923): Fiançailles – Fustel de Coulange. [Gallica] | [archive.org]

Vol. 6.1 (1924): G – Gotha. [Gallica] | [Hathi Trust – US only]

Vol. 6.2 (1925): Gothicum – Hypsistariens. [Gallica] | [Hathi Trust – US only]

Vol. 7.1 (1926): I – Invitatoire. [Gallica] | [Hathi Trust – US only]

Vol. 7.2 (1927): Iona – Iubilus. [Gallica] | [Hathi Trust – US only]

Vol. 8.1 (1928): Judaïsme – Latin. [Gallica] | [Hathi Trust – US only]

Vol. 8.2 (1928–29): Latran – Lexique. [Gallica]

Vol. 9.1 (1930): Lexique – Listes épiscopales. [Gallica]

Vol. 9.2 (1930): Lit – Lydie. [Gallica]

Vol. 10.1 (1932): Lyon – Manosque. [Gallica]

Vol. 10.2 (1932): Mans (Le) – Maximin (Saint). [Gallica]

Vol. 11.1 (1933–34): Maximum (Édit de) – Miniaturistes. [Gallica]

Vol. 11.2 (1933–34): Minister altaris – Monza. [Gallica]

Vol. 12.1 (1935–36): Mora vocis – Noé. [Gallica]

Vol. 12.2 (1935–36): Noirmoutier – Orvieto. [Gallica]

Vol. 13.1 (1936–37): Os – Papyrus. [Gallica]

Vol. 13.2 (1936–37): Pâques – Peinture (La). [Gallica]

Vol. 14.1 (1939–48): Peiresc-Porter. [not yet online]

Vol. 14.2 (1948): Portier – Rome. [archive.org]

Vol. 15.1 (1949–53): Ronchinne-Smedt (de). [not yet online]

Vol. 15.2 (1949–53): Smyrne-Zraïa. [not yet online]