Not sure if this will work out. I am starting this thread to share useful and interesting references. It would be great when the number of references grows in time with CTrs’ contributions. Of course, we have also have available numismatics.org, wildwinds, acsearch, gallica.bnf.fr, that are very well-known. Roman https://numismatics.org/ocre/results?lang=en (link thanks to @expat) https://www.sullacoins.com/library (link thanks to @Sulla80) https://rpc.ashmus.ox.ac.uk/ Roman Provincial http://www.lycianturkey.com/lycian_history.htm) http://augustuscoins.com/ed/ https://www.imperio-numismatico.com/h62-cartagonova-augusto https://www.beastcoins.com/Collections/KeithEmmettEgypt/KeithEmmettRomanEgypt.htm https://www.corpus-nummorum.eu/moesia/search/coins https://muenzen.uni-koeln.de/portal/home.html?l=de http://numismatics.org/zfn/38060000322719/66946.pdf https://as-de-nimes.pagesperso-orange.fr/classification/classification.html https://ric.mom.fr/en/home http://davy.potdevin.free.fr/Site/home.html A paper by Daniel Frascone about the Altar of Lugdunum: https://journals.openedition.org/rae/6654 C. Pannekeet "The_moneyers_issues_under_Augustus.pdf” https://www.academia.edu/4763120/The_moneyers_issues_under_Augustus The C. L. CAESARES denarii RIC I2 Augustus 208. A pseudo- Augustan unsigned restoration issue. Corpus, die study, metallurgical analyses, Bernhard Woytek, Maryse Blet-Lemarquand https://www.persee.fr/doc/numi_0484-8942_2017_num_6_174_3357 Description génerale des monnaies de la République Romaine communement appelées medailles consulaires par H. Cohen : Henry Cohen https://archive.org/details/bub_gb_5rEfjY5vDlIC/page/n5/mode/2up THE "RESTORED" COINS OF TITUS, DOMITIAN, AND NERVA by Harold Mattingly: The Numismatic Chronicle and Journal of the Royal Numismatic Society, Fourth Series, Vol. 20 (1920), pp. 177-207 https://www.jstor.org/stable/i40099877 Assorted Reverse Types Adventvs - Gloria Exercitvs http://www.constantinethegreatcoins.com/asst/ The Coins of Julius Caesar - Australian Centre for Ancient Numismatic Studies http://www.humanities.mq.edu.au/acans/caesar/Catalogue.htm Coins of Roman Egypt http://www.coinsofromanegypt.org/html/resources/resourceslist.htm#alexandriancoins Mintmarks of the Fourth Century AD https://finds.org.uk/romancoins/articles/page/slug/fourth-century-mints Gallienus Antoniniani collection of Frank Reinhardt, https://www.academia.edu/71026138/GALLIENVS_ANTONINIANII_PDF Celtic coins Great Britain: https://vanarsdellcelticcoinageofbritain.com/ https://rrimitations.ancients.info/ Greek F. De Luca, Monograms on staters minted in Aspendos during the IV-III Century BC, numerical notes linked to the size of the issue, Revue Numismatique OMNI no.13, 07-2019, pp.40-71 https://www.academia.edu/39997497/F...evue_Numismatique_OMNI_no_13_07_2019_pp_40_71 Cappadocian Tetradrachms in the Name of Antiochus VII, CATHARINE C. LORBER AND ARTHUR HOUGHTON http://www.royalnumismaticsociety.org/NC_Offprints/NC166/NC166_07_Lorber_Houghton_Vesely.pdf Royal Coinage in Hellenistic Phoenicia : Expressions of Continuity, Agents of Change Catharine C. Lorber https://www.persee.fr/doc/topoi_1764-0733_2015_act_13_1_2741 The coinage of the Lycian league, Hyla A. Troxell https://sites.google.com/site/digitallibrarynumis/03-index/t/troxell-hyla-a The coinage of Metapontum. Part 3 : Johnston, Ann https://archive.org/details/coinageofmetapon00john The Silver Coinage of the Macedonian Regions, 2nd – 1st century BC. | Ilya Prokopov https://www.academia.edu/1287497/The_Silver_Coinage_of_the_Macedonian_Regions_2nd_1st_century_BC Quelques noms de magistrats monétaires grecs. V. Les monétaires de Kymé d'Éolide Olivier Masson https://www.persee.fr/doc/numi_0484-8942_1986_num_6_28_1884 Die-coupling of "Die Münzen von Syrakus" by Erich Boehringer (1929) https://www.wildwinds.com/coins/pdfs/Syracuse_Boehringer_and_Tudeer.pdf Doris Raymond, "Macedonian Regal Coinage to 413 BC", New York 1953: https://babel.hathitrust.org/cgi/pt?id=mdp.39015072447793&view=page&seq=7 ANS (American Numismatic Society) http://numismatics.org/pella/?lang=en https://www.forumancientcoins.com/numiswiki/view.asp?key=pi-style (link thanks to @robinjojo) Medieval and Early Modern Data Bank, Rutgers University https://memdb.libraries.rutgers.edu/ https://catalogarchive.org/data/catalogs/ Taler Universe - Habsburg Dynasty Austro-Hungarian Taler Collection and History https://www.taleruniverse.com/the-t...ke-ferdinand-ii-of-further-austria-1564-1595/ Full text of "Erklärung der Abkürzungen auf Münzen der neueren Zeit, des Mittelalters und des Altertums https://archive.org/stream/erklaerungderab00schlgoog/erklaerungderab00schlgoog_djvu.txt Sassanian http://grifterrec.rasmir.com/sasania/kII_types/kII_types.html http://grifterrec.rasmir.com/sasania/sas_khuII_1.html
@cmezner there is also Online coins of the Roman Empire, unless I missed it in the list above https://numismatics.org/ocre/results?lang=en
Thanks for the links! I've found this source on Athenian intermediate "pi style" owls very useful for attributing a date range: https://www.forumancientcoins.com/numiswiki/view.asp?key=pi-style
Anonymous Class A Folles https://www.forumancientcoins.com/numiswiki/view.asp?key=Anonymous Byzantine Class A Folles
The Lydians and their World (2010) by John H. Kroll THE COINS OF SARDIS https://sardisexpedition.org/en/essays/latw-kroll-coins-of-sardis and https://www.neilsberman.com/pdf/news_The_Lydian_Lion.pdf