Sylloge Nummorum Graecorum, Copenhagen, The Royal Collection of Coins and Medals, Danish National Museum. (Copenhagen, 1942-1979).
Available online
This is one of the most often quoted references for Greek and Roman Provincial coins.
Part 1: Italy 1: Etruria-Campania. 1942
Part 2: Italy 2: Apulia-Lucania (Metapontum). 1942.
Part 3: Italy 3: Lucania (Poseidonia)-Bruttium. 1942.
Part 4: Sicily 1: Abacaenum-Petra. 1942.
Part 5: Sicily 2: Segesta-Sardinia. 1942.
Part 6: Thrace 1: The Tauric Chersonese-Thrace (Mesembria). 1942.
Part 7: Thrace 2: Odessus-Sestos. Islands. Kings and Dynasts. 1943.
Part 8: Macedonia 1: Acanthus-Uranopolis. Dynasts. 1943.
Part 9: Macedonia 2: Alexander I-Alexander III. 1943.
Part 10: Macedonia 3: Philip III-Philip VI. Macedonia under the Romans. Kings of Paeonia. 1943.
Part 11: Thessaly-Illyricum. 1943.
Part 12: Epirus-Acarnania.1943.
Part 13: Aetolia-Euboea. 1944.
Part 14: Attica-Aegina. 1944.
Part 15: Corinth. 1944.
Part 16: Phliasia-Laconia. 1944.
Part 17: Argolis-Aegean Islands. 1944.
Part 18: Bosporus-Bithynia. 1944. (includes Bosporus, Pontus, Paphlagonia, and Bithynia)
Part 19: Mysia. 1945.
Part 20: Troas. 1945.
Part 21: Aeolis-Lesbos. 1945.
Part 22: Ionia 1: (Clazomenae-Ephesus). 1946.
Part 23: Ionia 2: (Erythrae-Priene). 1946.
Part 24: Ionia 3: (Smyrna-Teos. Islands). 1946.
Part 25: Caria 1: (Alabanda-Orthosia). 1947.
Part 26: Caria 2: (Sebastopolis-Trapezopolis). Satraps. Islands. 1947.
Part 27: Lydia 1: (Acrasus-Saïtta). 1947.
Part 28: Lydia 2: (Sala-Tripolis). 1947.
Part 29: Phrygia 1: (Abbaïtis-Eumeneia). 1948.
Part 30: Phrygia 2: (Grimenothyrae-Trajanopolis). 1948.
Part 31: Lycia. Pamphylia. 1955.
Part 32: Pisidia. 1956.
Part 33: Lycaonia-Cilicia. 1956.
Part 34: Cyprus-Cappadocia. Uncertain coins. Imperial cistophori. 1956.
Part 35: Syria: Seleucid kings. 1959.
Part 36: Syria: Cities. 1959.
Part 37: Phoenicia. 1961.
Part 38: Palestine-Characene. 1961.
Part 39: Parthia-India. 1965.
Part 40: Egypt: The Ptolemies. 1977.
Part 41: Alexandria-Cyrenaica. 1974.
Part 42: North Africa. Syrtica-Mauretania. 1969.
Part 43: Spain-Gaul. 1979.
Supplement. Acquisitions 1942-1996. 2002
Parts 1-39 reprinted in 7 volumes. West Milford, New Jersey 1981-82.
Parts 40-43 reprinted in 1 volume. 1994.
Volume 1: Italy - Sicily (Parts 1 - 5). (West Milford, NJ, 1981).
Volume 2: Macedonia and Thrace (Parts 6 - 10). (West Milford, NJ, 1982). (Also includes the Tauric Chersonese, Samartia, Sythian Dynasts, Dacia, Moesia Superior and Moesia Inferior.)
Volume 3: Greece: Thessaly to Aegean Islands (Parts 11 - 17). (West Milford, NJ, 1982).
Volume 4: Bosporus - Lesbos (Parts 18 - 21). (West Milford, NJ, 1982). (Includes Bosporus, Pontus, Paphlagonia, Bithynia, Mysia, Troas, Aeolis and Lesbos)
Volume 5: Ionia, Caria and Lydia (Parts 22 - 28). (West Milford, NJ, 1982).
Volume 6: Phrygia to Cilicia (Parts 29 - 33). (West Milford, NJ, 1982).
Volume 7: Cyprus to India (Parts 34 - 39). (West Milford, NJ, 1982).
Volume 8: Egypt, North Africa, Spain - Gaul (Parts 40 - 43). (1994).
SNG Cop Supp. Supplement. Acquisitions 1942-1996. 2002. Digitized by Gallica, with an option for download, here.
Apart from two fascicules, Part 40 and Part 43, there is no table of contents published for these SNG volumes. The pdf linked below should help remedy that deficiency.