English: Shtokavian subdialects, before 20th century migrations (map is mostly made according to the book of Pavle Ivić (published in 1988) with additional info for Slovenia, not used in original Ivić's work).
Srpskohrvatski / српскохрватски: Štokavski poddijalekti, pre migracija u 20. veku (mapa je većim delom rađena prema knjizi Pavla Ivića (objavljenoj 1988. godine), sa dodatkom podataka o Sloveniji, koji nisu originalno korišćeni u Ivićevom radu).
detail (a few pixels in Slovenia) added by Kwamikagami to self-made map Shtokavian_subdialects1988.png by PANONIAN
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References
References for original map:
Dalibor Brozović - Pavle Ivić, Jezik, srpskohrvatski/hrvatskosrpski, hrvatski ili srpski, Jugoslavenski leksikografski zavod "Miroslav Krleža", Zagreb, 1988.
Josip Lisac, Hrvatska dijalektologija 1 - Hrvatski dijalekti i govori štokavskog narječja i hrvatski govori torlačkog narječja, Zagreb: Golden marketing - Tehnička knjiga, 2003.
Miloš Okuka, Srpski dijalekti, SKD Prosvjeta, Zagreb, 2008.