You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'ORDER BY issue DESC, `year` DESC ) QQ WHERE `year`<2100 ORDER BY modified DES...' at line 1 Bibliographies | Miko Flohr
 

De Ligt, L. and J. Bintliff (2020). Regional Urban Systems in the Roman World, 150 BCE - 250 CE. Mnemosyne Supplements History and Archaeology of Classical Antiquity 431. Leiden: Brill.