“…The development and diversification of archival data sources is allowing scholars to explore the role of new genres and text-types as adequate materials for sociolinguistic analysis: ego-documents, such as diaries, travel accounts, court records, recipes, and especially letters, are now seen as essential documents for research in this field at diastratic, diatopic and diaphasic levels (see Elspaβ 2002Elspaβ , 2012Tieken-Boon van Ostade 2005, 2006Nevala & Palander-Collin 2005;Palander-Collin, Nevala & Nurmi 2009;Palander-Collin 2010;Auer 2015;Schiegg 2016;Krogull, Rutten & van der Wal 2017;Voeste 2018;or Hernández-Campoy & García-Vidal 2018a, 2018b. Some monographs have also confirmed the relevance of these documents to reconstruct the sociolinguistic contexts of language variation and change in the past (see Dossena & Fitzmaurice 2006;Nevalainen & Tanskanen 2007;Dossena & Tieken-Boon van ostade 2008;Sairio 2009Sairio , 2017Dossena & Del lungo Camiciotti 2012;van der Wal & Rutten 2013;Rutten & van der Wal 2014;Auer, Schreier & Watts 2015).…”