I am a self-confessed stamp catalogue collector - I LOVE specialized catalogues because of the wealth of additional information they contain. If you know what to look for you can find hidden higher-value variants lurking in dealer stocks or online that dealers do not realize they have because they only use the basic Michel/Gibbons/Scott/Yvert.
Anyways here is my updated Catalogue List (I think its complete up to my latest purchase from Bolivia), including physical hardcopies, online catalogues, and some digital copies for hard to find catalogues (to eventually be replaced by hardcopy versions at some point)
Hold on tight this list is long
Online Catalogues
Michel Online
Yvert Online
Scott 2021 Standard (6 vols) and Classic Specialized
ANK Austria Specialized Online
Cefiloza Argentina Specialized
Downloads
Zagorskiy Specialized Russia 1845-1917 (PDF)
Zagorskiy Specialized Russia 1917-1923 (PDF)
Zagorskiy Specialized USSR 1923-1940 (PDF)
Zagorskiy Azerbaijan 1918-1923
Soloviev Specialized Russia & USSR (8 vols PDF)
Leo Temprano Colombia PDF
Bertossa Ecuador Specialized PDF
Bustamante Peru Specialized 1982 (PDF)
Chan China 1878-1949 (2 vols PDF)
Michel German Private Posts of Imperial Era (PDF)
Hard Copies :
Americas :
Michel Worldwide ATM Stamps 2014
Scott 2017 US Specialized
2016 Unitrade Canada
Gibbons Canada 2019
EDIFIL Spain Specialized vols 9 2012-2013 (covers Spanish West Indies and Philippines)
Gibbons North Caribbean
Gibbons Leeward Islands
Gibbons Windward Islands
Gibbons Belize/Guyana/Trinidad
Hector Mena Costa Rica
Gibbons Central America 3rd Edition
Gibbons South America 4th Edition
CEFIBOL Bolivia 2021
RMB Brasil 2019 specialized
Printouts from PDF of the Ciardi Uruguay 2006 specialized
Filatelia Chilena's Chile 2005 Specialized
Jalil 2009 Argentina Specialized
Gibbons Falkland Islands
Oceania :
Campbell Patterson 2015 New Zealand
Seven Seas Australia 2017
Gibbons New Zealand
Gibbons Australia
Gibbons Western Pacific
Gibbons Eastern Pacific
Brusden-White Specialized Australia Catalogs (Kangaroos, George V, George VI, Elizabeth II pre-Decimal, Postage Dues, Decimals 1 and 2)
Asia :
Prangko Indonesia 2018
Zonneblom Indonesia
Ngo Philippines Republic 3 vols 1946-2014
ISC Malaysia-Singapore-Brunei
Gibbons Malaysia-Singapore-Brunei
Thailand Thai Stamp Catalogue 2014
JSCA Japan Specialized 2016-2017 v 1 & 2 (defins to 1989)
JSCA Japan Specialized 2020 vol 2 2020 (defins 1786-1908, bilingual Japanese-English)
Sakura Japan 2013
Korea Postage Stamp Catalogue 2020-2021
Gibbons China 2015
China Specialist Society 2015 China to 1949 Specialized
Yang Communist China Liberated Areas
Yang Peoples Republic of China 2009
Gibbons Hong Kong
Phila-India India 2021-2022
Gibbons India & States
Gibbons Pakistan-Bangladesh-Burma-Sri Lanka
Farakhbash 2021 Iran Specialized
Gibbons Arabia 2016
Gibbons Middle East
Europe :
Zagorskiy 2016 Russia 1857-1965, 2012 USSR 1966-1991, 2016 Russian Federation post 1991
Zverev’s Russia Specialized 1857-1940
Gibbons Collect UK 2015
Gibbons Collect Channel Islands 2015
Hibernian Ireland 2014
Gibbons Ireland
Maury France Specialized 2011
Maury DOM-TOM 2009 Specialized
Maury Colonies Europe-Asia 2011 Specialized
Maury Polar Lands and Principalities 2011
Yvert French Colonies 2017
EDIFIL Spain Specialized vols 1-6 2010-2013
Mundifil Portugal 2020
Gibbons British Mediterranean
Sassone Italy 2021 2 vols
Michel Germany Specialized 2014 v. 1 and 2
Michel Switzerland Specialized 2016-2017
Michel Liechtenstein Specialized 2016-2017
COB Belgium Specialized 2016
NPVH Netherlands Specialized 2020
Michel-Prifix Luxemboug
AFA Denmark 2021
Facit Norden 2016 2 vols
Norgeskatalogen 2013
LaPe Specialized Finland 2021
Fischer Poland 2016 2 vols
POFIS Czechoslovakia 3 vols to end 1992
POFIS Czech Republic 1993-2019
Philatelia Hungarica Hungary Specialized 2016-17
Zimbrul Carpatin Romania 3 vols 1858-2009
Slovenika Slovenia 2020
SFK 2011 Specialized Catalog of Serbia and Yugoslavia
SFK 2015 Specialized Catalog of ex-Yugoslav lands (Slovenia, Croatia, Bosnia, up to 1992)
Thika Stamps Of Albania 2013 (more a history of postage stamps than catalog, but great resource)
Karamistos Greece 2020 Specialized 3 vols
ISFILA Turkey Specialized 2021-2022
Africa :
The Nile Post Egypt
Gibbons Northeast Africa 2017
Yvert Independent Francophonie 2013 2 vols (mostly Africa but also Vietnam, Cambodia, Laos and Vanuatu)
Maury French Colonial Africa 2006
EDIFIL Spain Specialized vols 7-8 2012-2013 (covers African colonies)
Gibbons West Africa
COB Belgian Colonies & Successors 2016
Gibbons East Africa
Sciaky Ethiopia Stamps and Postal History 3 vols (like Thika’s Albania not so much catalog but history of postage stamps of Ethiopia, a great reference)
Gibbons Indian Ocean
Gibbons Southern & Central Africa
South Africa Collectors Society South Africa Specialized 2013
Mundifil Portuguese Colonies 2019 (mostly Africa but also Goa, Macao and Timor)
Gibbons South Atlantic Islands
On Order awaiting Delivery
Gibbons Italy 2022
Gibbons Russia 2012
Gibbons Southeast Asia 2012
(I am actively filling in my Gibbons hardcopy collection because Gibbons' current financial health makes one wonder how much longer it will be around, especially with the Magenta Albatross around its neck now.
Only a couple more volumes I am looking for : Central Asia and Japan & Korea, both of which were last produced in like 2007-2008 so hard to find, at least not had luck so far.)Last year I had to move my library from its former 5-level bookshelf to a new set of three three-level bookshelves as I had finally run out of room.